Patent Description:
Numerous flotation aids for use in swimming are available. One commonly used flotation device is a pull buoy, which can be used to immobilize and float a swimmer's legs in order to allow the swimmer to focus on his/her upper body motions. Existing pull buoy solutions require varying degrees of inconveniences while swimming. The predominant design is a singular figure eight form that the swimmer places between his/her thighs. This requires the swimmer to squeeze his/her thighs tightly to keep the buoy in place. The buoy requires frequent placement adjustments while swimming and is especially difficult to keep in place when kicking off a wall of a pool to change direction. Other pull buoys involve an ankle cuff with openings on the outside of each ankle cylinder which allows the swimmer to insert or remove his/her ankles from the buoy.

Another commonly used flotation device is a kickboard, which can be used to allow the swimmer to focus on his/her lower body motions. The predominant kickboard designs involve a floating board or foam shape which the swimmer holds at surface level. This design requires the swimmer to assume an upright position with arms at water surface level and upper body and head above water. This position differs from a more hydrodynamic form when engaging in a crawl stroke where the head is facing underwater and hands target a position that is many cm (inches) below water surface at the farthest reach point.

In training sessions, swimmers will often do intervals where they switch between using a pull buoy, a kickboard, and other training devices. The swimmers often do not have much time to make the change before starting their next interval. Flotation devices having an elliptical horizontal portion, a vertical member, and an enlarged prolate top are disclosed in <CIT> and <CIT>. A further swimming aid is disclosed in youtube. com/watch?v=oXt3Wv3TGjc&t=<NUM>.

In view of the above, the inventor recognizes a need to offer the swimmer a flotation device that may be used as a pull buoy, placed between his/her thighs. Embodiments of a flotation device described herein can be configured to fit snugly between the thighs, so that the swimmer can use the device without concern that the flotation device will slide back towards the feet or require adjustment.

The inventor also recognizes a need for a flotation device that may be used as a kickboard, where the leading hand of the swimmer reaches towards a point below, rather than at, the surface of the water. This format supports a natural, hydrodynamic position and works well for common drills, such as the "catch-up" drill where the swimmer keeps one hand forward until the second hand completes a full stroke.

The invention provides a flotation device having the features of claim <NUM>. Embodiments of a flotation device described herein can incorporate the pull buoy and kickboard concepts into a single coherent design of a flotation device, which supports alternating pull buoy and kickboard drills with a single flotation device.

According to the invention, the flotation device described herein includes, when used as a pull buoy, a horizontal flotation element that rests above the thighs, a vertical stem element that extends from the flotation element down to a final element which includes a horizontal bar or span that extends between the lower part of the swimmer's thighs. The differential of water flow below and above the swimmer's legs serves to put rotational pressure on the bottom and top of the pull buoy construction, tilting the surface level element forward and creating a lock. According to the invention, the flotation element is to be located at the water surface when used as a pull buoy.

Embodiments of a flotation device described herein can include a tapered shape for the stem that, when used as a pull buoy, includes a region that is wider near the swimmer's upper thigh and more narrow on the point facing the feet. In this configuration, when the swimmer squeezes the stem, the stem naturally moves towards the swimmer's trunk rather than slipping towards the swimmer's legs.

Embodiments of a flotation device described herein can include a tapered shape for the stem that, when used as a pull buoy, includes a region that is narrower near the swimmer's upper thigh and wider on the point facing the feet. When in use as a pull buoy in this configuration, the taper of the stem can counteract the water flow, causing the stem to move towards the swimmer's trunk.

Embodiments of a flotation device described herein can include, when used as a kickboard, a horizontal flotation element, a vertical stem element that extends from the flotation element downwards below the water's surface, and a sub surface element on the stem which can be held by one or two hands. In this form, the swimmer's hand(s) hold an element of the pull buoy located below the surface. Use of the flotation device in this manner can mimic a swimmer's actual form when doing the crawl and comes without the hydrodynamic sacrifice when a swimmer's head and shoulders are above the surface when using a traditional kickboard.

According to the invention, the flotation device provides a combination of the above aspects where a single device satisfies as both pull buoy and kickboard.

Embodiments of a flotation device described herein can be made of a variety of materials. In an embodiment, the surface element can be made of a foam material while the stem could be a hollow molded plastic piece. However, it is understood that the flotation device can be formed of any combination of materials providing a desired buoyancy.

To this extent, a flotation device, particularly suitable for use as a pull buoy and a kickboard, is described herein. The flotation device can include a flotation element and a stem element, which extends from an inner surface of the flotation element. A holding mechanism can be located adjacent to the second end of the stem element. The stem element and holding mechanism can be configured to enable a user to hold onto the flotation device at a point below the surface of the water for use as a kickboard or enable a user to secure the stem element of the flotation device between his/her legs for use as a pull buoy. An embodiment of the stem element can be tapered, which can create forces that assist the user in using the flotation device as either a pull buoy or a kickboard.

The flotation device according to the invention comprises: a flotation element having an inner surface; a stem element having a first end extending from the inner surface of the flotation element, wherein the stem element is formed of a rigid material, and wherein a primary axis of the stem element is approximately perpendicular to the flotation element along a front-back centerline of the flotation device; and a holding mechanism located adjacent to a second end of the stem element, opposite the first end.

In an embodiment, the flotation device according to the invention can comprise: a stem element configured to be held between a swimmer's legs during use as a pull buoy wherein at least a portion of the stem element is tapered from a region of the stem element located between the swimmer's leg's on a side closer to the swimmer's waist towards an end of the stem element located on a side closer to the swimmer's feet.

The inner surface can have a front side and a back side and the holding mechanism can include a pair of horizontal protrusions, each horizontal protrusion extending from a lateral side of the stem element between approximately <NUM> (three inches) and approximately <NUM> (fourteen inches).

The illustrative aspects of the invention are designed to solve one or more of the problems herein described and/or one or more other problems not discussed.

These and other features of the disclosure will be more readily understood from the following detailed description of the various aspects of the invention taken in conjunction with the accompanying drawings that depict various aspects of the invention.

As indicated above, aspects of the invention provide for a flotation device, which can be used as a swimming pull buoy or kickboard. In illustrative embodiments, the flotation device includes at least one horizontal flotation surface with at least one stem. In the case that the stem has a surface, handle or hole for a hand hold it may be used as a kickboard where the hand is supported under-water instead of at the surface as is the case in a traditional kickboard. In the case that the stem has horizontal protrusion(s) near the bottom, the device can be used as a pull buoy as the protrusion(s) will provide the necessary means to squeeze and hold the flotation device between the swimmer's thighs. In the case that the protrusion(s) spans adequately near to the center point of the thighs, the pull buoy will lock into place and require little to no effort by the swimmer to maintain its position.

Turning to the drawings, <FIG> show front, bottom, and side views, respectively, of an illustrative flotation device <NUM> according to an embodiment. The flotation device <NUM> is configured to be utilized as either a pull buoy or a kickboard. To this extent, the flotation device <NUM> includes a flotation element <NUM>, a stem element <NUM>, and a holding mechanism <NUM>. As illustrated most clearly in <FIG>, the flotation device <NUM> has a front side <NUM> and a back side <NUM> and a front-back centerline CLFB. The stem element <NUM> can extend from a bottom (inner) surface of the flotation element <NUM>. As shown in <FIG>, the stem element <NUM> can be approximately perpendicular with the respect to the lateral left-right width of the flotation element <NUM> along the front-back centerline CLFB. In a more particular embodiment, one or more of the flotation element <NUM>, the stem element <NUM>, and/or the holding mechanism <NUM> can be symmetrical on both sides of the front-back centerline CLFB.

In an embodiment, the flotation element <NUM> can be formed of a foam or molded rubber element <NUM>, which approximates the size and shape of a standard kickboard and may provide most of the flotation for the flotation device <NUM>. In an illustrative embodiment, the flotation element <NUM> is formed from at least one of: silicone, polyethylene foam, ethylene-vinyl acetate (EVA), neoprene, and/or the like. As illustrated, the flotation element <NUM> can have a lateral triangular shape, which tapers from the back side <NUM> to the front side <NUM>. However, it is understood that this is only illustrative of various possible shapes for the flotation element <NUM>. For example, an embodiment of the flotation element <NUM> can have a lateral diamond shape, in which the central region is the widest and tapers to both the back side <NUM> and the front side <NUM>. In this case, each taper can be the same or different. In still another embodiment, the flotation element <NUM> can have a lateral circular or elliptical shape. Additionally, it is understood that reference to the front side <NUM> and back side <NUM> is for convenience only. To this extent, when in use, the back side <NUM> may be facing the current while the front side <NUM> is located away from the flow of the current. Similarly, while the flotation device <NUM> is also described as having a top, bottom, left, and right, it is understood that this orientation is used for clarity in describing attributes of the flotation device <NUM> shown in the drawings. To this extent, it is understood that the flotation device <NUM> and other embodiments of flotation devices described herein can be used and/or configured for use in any orientation.

In an illustrative embodiment, a front-back height of the flotation element <NUM> and a left-right width of the flotation element <NUM> are between approximately <NUM> (five inches) and approximately <NUM> (twenty-four inches). In a more particular illustrative embodiment, the front-back height and the left-right width of the flotation element <NUM> are between approximately <NUM> (six inches) and approximately <NUM> (eighteen inches). In a still more particular illustrative embodiment, the front-back height and the left-right width of the flotation element <NUM> are between approximately <NUM> (six inches) and approximately <NUM> (thirteen inches). In a still more particular illustrative embodiment, the front-back height is between approximately <NUM> (six inches) and approximately <NUM> (ten inches), while the left-right width is between approximately <NUM> (nine inches) and approximately <NUM> (thirteen inches).

In an embodiment, a total lateral surface area for the flotation element <NUM> is between approximately <NUM> square cm (<NUM> square inches) and approximately <NUM> square cm (<NUM> square inches). In a more particular embodiment, the total lateral surface area for the flotation element is between approximately <NUM> square cm (<NUM> square inches) and approximately <NUM> square cm (<NUM> square inches). In a still more particular embodiment, the total lateral surface area for the flotation element is between approximately <NUM> square cm (<NUM> square inches) and approximately <NUM> square cm (<NUM> square inches). In an illustrative embodiment of the flotation element <NUM>, the front-back height is approximately <NUM> (<NUM> inches), the left-right width is approximately <NUM> (<NUM> inches), and the total lateral surface area is approximately <NUM> square cm (<NUM> square inches). In another illustrative embodiment of the flotation element <NUM>, the front-back height is approximately <NUM> (<NUM> inches), the left-right width is approximately <NUM> (<NUM> inches), and the total lateral surface area is approximately <NUM> square cm (<NUM> square inches).

The stem element <NUM> can extend from a location of the bottom (inner) surface of the flotation device <NUM> that is located in the back half of the flotation device <NUM>. In an illustrative embodiment, a center of the stem element <NUM> is located approximately one third from the back side <NUM> of the flotation device <NUM>. As illustrated most clearly in <FIG>, the stem <NUM> can have an approximately perpendicular orientation with respect to the front-back height of the flotation element <NUM>. Additionally, the stem element <NUM> and/or the holding mechanism <NUM> can be symmetrical on either side of a left-right centerline CLLR of the stem element <NUM>. However, it is understood that other orientations are possible. For example, the stem element <NUM> can be oriented such that the bottom of the stem element <NUM> (with the holding mechanism <NUM>) is further back from the flotation element <NUM> than the location at which the top of the stem element <NUM> extends from the flotation element <NUM>.

As discussed herein, the stem element <NUM> can have a dimension that is suitable for using the flotation device <NUM> as both a pull buoy and a kickboard. In an embodiment, the stem element <NUM> has a dimension selected such that the flotation element <NUM> and the holding mechanism <NUM> are spaced to comfortably and securely hold the flotation device <NUM> between the thighs of a swimmer. In an illustrative embodiment, the stem element <NUM> has a length between approximately one half of a left-right width of the flotation element <NUM> and approximately one and one-third the left-right width of the flotation element <NUM>. In a more particular embodiment, the stem element <NUM> extends downward from the bottom of the flotation element <NUM> in a range between approximately <NUM> (four inches) and approximately <NUM> (fourteen inches). In a still more particular embodiment, the stem element <NUM> extends downward from the bottom of the flotation element <NUM> in a range between approximately <NUM> (six inches) and approximately <NUM> (twelve inches). In an embodiment, a total depth of the flotation device is between approximately <NUM> (seven inches) and approximately <NUM> (twelve inches).

As discussed herein, the holding mechanism <NUM> can be configured to enable the flotation device <NUM> to be used as both a pull buoy and a kickboard. To this extent, the holding mechanism <NUM> can be configured to allow the stem element <NUM> of the flotation device <NUM> to be placed between the legs of a swimmer and held in place by surface tension between the legs of the swimmer and the flotation element <NUM> and the holding mechanism <NUM>. In this case, the holding mechanism <NUM> can include one or more protrusions 114A, 114B. A protrusion 114A, 114B can extend laterally left or right from the stem <NUM> and have a lateral orientation approximately parallel with the lateral orientation of the floating element <NUM>. In an illustrative embodiment, a protrusion 114A, 114B extends from the stem element <NUM> a distance between approximately <NUM> (three inches) and approximately <NUM> (fourteen inches). In a more particular embodiment, a protrusion 114A, 114B extends from the stem <NUM> a distance between approximately <NUM> (four inches) and approximately <NUM> (seven inches).

When used as a kickboard, a swimmer can hold the protrusions 114A, 114B with both hands. In an embodiment, the holding mechanism <NUM> can be configured to allow the swimmer to hold onto the holding mechanism <NUM> with only one hand in a manner that does not cause the flotation device <NUM> to become disoriented when in use. To this extent, the holding mechanism <NUM> can include an opening <NUM> located adjacent to a bottom of the stem element <NUM>. As illustrated, the opening <NUM> can be located along a front-back centerline CLFB of the flotation device <NUM>, thereby providing a central location at which the swimmer can hold onto the flotation device <NUM> with one hand. The opening <NUM> can have any size and/or shape suitable for allowing the swimmer to grasp the holding mechanism <NUM>. While an opening <NUM> is shown, it is understood that this is only illustrative of various possible mechanisms for grasping the holding mechanism <NUM>. For example, in an alternative embodiment, the holding mechanism <NUM> can comprise a handle located adjacent to the bottom of the stem element <NUM>.

The stem element <NUM> and holding mechanism <NUM> can be formed of any suitable material. In an embodiment, the entire flotation device <NUM> is formed of a single molded material. Alternatively, the stem element <NUM> and holding mechanism <NUM> can be formed of a material more rigid than the material forming the flotation element <NUM>, such as a molded rigid plastic. The stem element <NUM> and/or the holding mechanism <NUM> can be solid or have a hollow interiors.

In still other embodiments, a total distance between a bottom of the flotation element <NUM> and a top of the holding mechanism <NUM> can be adjustable. To this extent, the stem element <NUM> can be attached to one or both of the flotation element <NUM> and/or the holding mechanism <NUM> using an attachment solution that allows for selective vertical movement of the flotation element <NUM> and/or the holding mechanism <NUM> along the height of the stem element <NUM>. For example, the flotation element <NUM> and/or the holding mechanism <NUM> can be configured to allow variable placement and selective fastening to any of multiple positions (defined or variable) along a height extending at least a portion of from one or both ends of the stem element <NUM>, which can be selectively fixed in a desired location by a gear/ratchet structure, one or more set screws, and/or the like.

Embodiments of a flotation device described herein can have a front-back centerline CLFB defined by one or more features of the flotation device. Illustrative features that can define the front-back centerline CLFB of a flotation device include one or more of: a shape of the flotation element <NUM>, a shape of the stem element <NUM> (e.g., an elongate lateral cross-section), a connection point between the flotation element <NUM> and the stem element <NUM> (e.g., can be located closer to the back or front), an orientation of the stem element <NUM> with respect to the flotation element <NUM> (e.g., can be oriented toward the back), a shape and/or orientation of the holding mechanism <NUM> (e.g., can define the lateral sides of the device), and/or the like. However, it is understood that embodiments of a flotation device described herein can have no inherent feature that defines a front/back, a left/right, and/or a top/bottom.

<FIG> show a perspective and exploded view, respectively, of a three piece flotation device <NUM> including a triangular flotation element <NUM>, a triangular stem element <NUM>, and a triangular locking piece <NUM> according to an embodiment, while <FIG> shows a lateral cross-sectional view of the stem element <NUM> according to an embodiment. In this case, the stem element <NUM> and the holding mechanism <NUM> comprise a single molded piece, while the flotation element <NUM> is another piece. The locking piece <NUM> can be sized to be inserted into an opening in the flotation element <NUM> and be held secure in place via surface tension, glue, and/or the like. The locking piece <NUM> can include an opening, which is sized to enable an end of the stem element <NUM> to be inserted therein and held secure in place via surface tension, glue, and/or the like.

In an embodiment, the locking piece <NUM> and the opening in the flotation element <NUM> have complementary shapes that only allow the locking piece <NUM> to be inserted into the opening in a single direction. Similarly, the opening on the locking piece <NUM> and the stem element <NUM> can have complementary shapes such that the stem element can only be mounted in a single direction. Alternatively, one or both of the openings and corresponding shapes of the components can be configured to allow the corresponding component to be inserted in any one of multiple directions. For example, an opening and the corresponding shape can be configured to allow the component to be selectively inserted facing a forward direction or a backward direction. In this case, the components can be secured to each other using a solution that allows for the removal and reinsertion of the corresponding component.

It is understood that use of the locking piece <NUM> connecting the stem <NUM> to the flotation element <NUM> is only illustrative. In other embodiments, the flotation device <NUM> could be built as a single piece or two piece device. Additionally, the pieces could connect in alternate ways. For example, <FIG> show front, side, and exploded views, respectively, of a three piece flotation device <NUM> according to another embodiment. In this case, the stem element <NUM> connects to the locking piece <NUM> using a male/female threaded connector 108A, 108B. Additionally, the locking piece <NUM> is shown including a vertical extension 108C, which can enable a user to rotate the locking piece <NUM> in order to attach or detach the stem element <NUM> therefrom. As shown most clearly in <FIG>, the flotation element <NUM> can have an opening that prevents the stem element <NUM> from rotating when inserted therein. The opening also can limit an extent to which the stem element <NUM> can be inserted and include a second portion that has a complementary shape to the locking piece <NUM>.

In addition to other materials, a variety of foam, plastic, and rubber combinations may be implemented for any of the embodiments. Furthermore, flotation may be achieved using a foam, rubber, or even hollow plastic or carbon structure.

As illustrated most clearly in <FIG>, a lateral cross section of the stem element <NUM> can be tapered, e.g., from front to back. In an embodiment, the stem element <NUM> has a lateral front-back height that is approximately twice a lateral left-right width. However, it is understood that this is only illustrative. In embodiments, the stem element <NUM> can have a lateral front-back height that is anywhere between approximately the same as a lateral left-right width to approximately three times the lateral left-right width. In another more particular illustrative embodiment, the stem element <NUM> has a lateral front-back height that is approximately thirty percent larger than the lateral left-right width.

The tapered shape offers hydrodynamics when the flotation device <NUM> is used as a kick board. When the flotation device is turned around and used as a pull buoy, the tapered shape will encourage the stem <NUM> to move towards the waist when the flotation device <NUM> is squeezed between the swimmer's thighs. <FIG> shows an alternative lateral cross section of the stem element <NUM>. In this case, the stem element <NUM> is widest in a central region and tapers both towards the front and the back from the central region. The lateral front-back height can be approximately two to five times the lateral left-right width of the stem element <NUM>. This configuration can, for example, provide additional comfort for the swimmer when the flotation device <NUM> is used as a pull buoy. It is understood that the lateral cross-sections shown in <FIG> are only illustrative of various cross-sections that include a taper. For example, a stem <NUM> can have an oval (egg-shaped) lateral cross-section, a trapezoidal lateral cross-section, and/or the like.

The protrusions <NUM> of the holding mechanism <NUM> located at the bottom of the stem <NUM> can be placed under the swimmer's thighs when the flotation device <NUM> is used as a pull buoy. In this case, the flotation device <NUM> can be located such that the front side of the flotation device is located toward the swimmer's feet.

The holding mechanism <NUM> at the bottom of the stem <NUM> may be used as a hand hold when the flotation device <NUM> is used as a kickboard. Similar to the stem element <NUM>, protrusions <NUM> may be tapered for hydrodynamics. As discussed herein, the swimmer can grasp the protrusions <NUM>, or the hole <NUM> located at the bottom of the stem element <NUM> may be used as a handhold, when the flotation device <NUM> is used as a kickboard. A handle or grip could also be built into the vertical part of the stem element <NUM>. In an embodiment, the holding mechanism <NUM> can be selectively removed from and attached to the stem element <NUM>. For example, the holding mechanism <NUM> can be attached to the stem element <NUM> when the flotation device <NUM> is used as a pull buoy, and removed from the stem element <NUM> when the flotation device <NUM> is to be used as a kickboard.

<FIG> show a swimmer using the flotation device <NUM> alternately as a pull buoy and as a kickboard, respectively. In the pull buoy implementation shown in <FIG>, the stem element <NUM> of the flotation device <NUM> fits between the thighs. According to the invention, the flotation element <NUM> is to be located at the water surface level with the holding mechanism <NUM> located on the bottom. In the kickboard implementation shown in <FIG>, the swimmer reaches forward and rests at least one hand on the stem element <NUM> and/or the holding mechanism <NUM>, if utilized. The swimmer may also hold the flotation element <NUM> located at a water surface level, if desired.

Various other embodiments of a flotation device described herein are possible. To this extent, <FIG> shows an embodiment of a flotation device <NUM> with a more substantial holding mechanism <NUM>, e.g., in the form of a handle having an elliptical or rounded rectangular shape. In <FIG>, the flotation element <NUM> is shown located on a surface side of the water, above the swimmer's thighs. In <FIG>, the flotation device <NUM> is shown alternately with the flotation element <NUM> located underwater, below the swimmer's thighs. <FIG> also depicts how the flotation device <NUM> can be used as a kickboard.

<FIG> shows an embodiment of a flotation device <NUM> that includes two flotation elements 132A, 132B and a stem element <NUM> located there between. The flotation elements 132A, 132B can be configured similarly, or one flotation element, such as the flotation element 132B, can be larger than the other flotation element, such as the flotation element 132A. <FIG> show how the orientation of this embodiment of a flotation device <NUM> could be used with either flotation element 132A, 132B on the top or bottom. In an embodiment, the stem element <NUM> can have an elliptical (e.g., circular) lateral cross-section. Alternatively, the stem element <NUM> can have a lateral cross-section as shown and described herein, e.g., including one or more tapered regions (e.g., forming a triangular, diamond-shaped ,oval, trapezoidal, and/or the like, lateral cross-section).

<FIG>, <FIG>, <FIG> show still further alternate embodiments of flotation devices that are configured to provide a snug fit between the legs of the swimmer and a shape where the water flow also provides the rotational torque to secure the device better than the traditional figure-<NUM> pull buoy designs.

In <FIG>, the flotation device <NUM> includes a narrowed central section <NUM> forming a stem element, with wider top and bottom flotation elements 142A, 142B. Similarly, in <FIG>, the flotation device <NUM> includes a narrowed central section <NUM> forming a stem element, with wider top and bottom flotation elements 152A, 152B. Similarly, in <FIG>, the flotation device <NUM> includes a narrowed central section <NUM> forming a stem element, with wider top and bottom flotation elements 162A, 162B. As illustrated in each of these embodiments, the flotation device <NUM>, <NUM>, <NUM> can include one flotation element that is larger than the other, and as also shown and described with respect to the flotation device <NUM> in <FIG>, either flotation element can be located on the water surface when used by a swimmer. In each embodiment, the narrowed central section <NUM>, <NUM>, <NUM> forming the stem element can have a rectangular lateral cross-section. Alternatively, the narrowed central section <NUM>, <NUM>, <NUM> can have a lateral cross-section as shown and described herein, e.g., including one or more tapered regions (e.g., forming a triangular, diamond-shaped ,oval, trapezoidal, and/or the like, lateral cross-section).

In each of the flotation device embodiments shown and described herein, a stem element is configured to be held between a swimmer's legs. The stem element can be tapered such that, at least the portion of the stem element located between the swimmer's legs tapers from a side closer the swimmer's waist towards a side closer to the swimmer's feet. Such tapering can provide a force that pushes the flotation device towards the swimmer's waist during use, which results in the flotation device remaining in place easier than with prior art pull buoys.

As used herein, terms of degree such as "about" and "approximately," mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. In an embodiment, these terms can be construed as including a deviation of ± <NUM>% of the modified term when this deviation would not negate the meaning of the word it modifies.

Claim 1:
A flotation device to be used alternatively as a pull buoy or a kickboard by a swimmer comprising:
a flotation element (<NUM>) having an inner surface;
a stem element (<NUM>) having a first end extending from the inner surface of the flotation element (<NUM>), wherein the stem element (<NUM>) is formed of a rigid material, and wherein a primary axis of the stem element is approximately perpendicular to the flotation element along a front-back centerline of the flotation device,
wherein the stem element is to be arranged between the legs of the swimmer during use as a pull buoy;
and a holding mechanism (<NUM>) located adjacent to a second end of the stem element, opposite the first end,
wherein the inner surface of the flotation element (<NUM>) has a lateral width between approximately fifteen centimeters and approximately thirty centimeters,
wherein the holding mechanism comprises protrusions (114A, 114B) extending laterally from lateral sides of the stem element,
wherein the protrusions each have an inner surface approximately parallel to a lateral orientation of the flotation element,
wherein the protrusions each extend between approximately eight centimeters and approximately thirty-six centimeters, and
wherein the flotation element (<NUM>), the stem element (<NUM>), and the protrusions are configured so as to enable the flotation element (<NUM>) to lock into place with respect to the swimmer's legs during use as a pull buoy.