Patent ID: 8025549

Claim:
A hula-hoop for pressing the flesh of the waist in a vertical direction, comprising: first and second rings stacked on top of each other in a vertical direction, wherein the vertical direction is defined to be parallel to the direction of gravity when the hula- hoop is positioned horizontally pressing a portion of waist of a user; protruding parts and grooves alternately provided along entire ring of each of the first and second rings in the vertical direction, wherein the protruding parts and grooves of each of the first and second rings are connected to each other continuously and repeatedly in an order of protruding part-groove-protruding part-groove-and-so-on, such that each of the first and second rings forms a ring that is circular when viewed above the ring and curved and sinusoidal when viewed in a direction across the ring; and streamlined and sinusoidal body pressing space defined in the vertical direction that is parallel to the direction of gravity when the hula-hoop is positioned horizontally pressing a portion of waist of the user between two vertically neighboring grooves of the first and second rings by attaching vertically approaching protruding parts to each other with means for attaching, so that the waist flesh of the user is pinched in the streamlined and sinusoidal body pressing space in the same vertical direction that is parallel to the direction of gravity when the hula-hoop is positioned horizontally pressing a portion of waist of the user, thus providing pressing force to the waist of the user in the same vertical direction that is parallel to the direction of gravity when the hula-hoop is positioned horizontally pressing a portion of waist of the user when the user turn the hula-hoop around a body part, wherein the protruding parts and the grooves of the first and second rings defining the streamlined and sinusoidal body pressing space are disposed so as to directly touch and press the waist flesh at least when the protruding parts and the grooves of the first and second rings around a central portion of the streamlined and sinusoidal body pressing space are right on the waist flesh, and wherein the streamlined and sinusoidal body pressing spaces exert sinusoidal pressure along the waist of the user in the vertical direction that is parallel to the direction of gravity when the hula-hoop is positioned horizontally pressing a portion of waist of the user, while inner portions of the first and second rings press the waist of the user in a horizontal direction that is directed into the waist flesh and perpendicular to the direction of gravity.