A multi-purpose transportable exercise device for training of balance, strength and flexibility, wherein the said device comprises: - a base plate comprising: ∘ two rotating surfaces, wherein rotation is enabled by suitable bearings and the surfaces may be equipped with exercise mats of different stiffness, said rotatable surfaces may be locked so that no rotation is possible or unlocked so that rotation is possible; ∘ a locking mechanism for locking the position of rotating surfaces in case their rotation is not required, ∘ at least one bottom attachment site, preferably more, for attaching a fulcrum element (F1, F2) for balance training, ∘ at least one side attachment site, preferably more, most preferably four, for attaching a belt or elastic band for strength training, - the fulcrum element (F1, F2) to be attached to the bottom attachment sites, wherein the said fulcrum element (F1, F2) may be: ∘ a cylindrical element, ∘ a cylindrical element, composed of two half-cylindrical elements, ∘ a cylindrical element, composed of two half-cylindrical elements and at least one half-spherical element, or ∘ a half-spherical element, and/or - at least one, preferably a set of belts and/or elastic bands (B, E) with different levels of stiffness, which may be attached to the side attachment sites; characterized in that the locking mechanism is attached to the middle of the central plate, between the two rotating surfaces and is designed as a lock and release pin attached to the base plate with a spring, wherein the pin placed parallel to the length of the base plate is arranged to lock the position of the rotating surfaces by covering a part of both rotating surfaces, while transverse position of the pin allows rotation of the rotating surfaces, wherein the locking mechanism is arranged to be pulled away from the plate, rotated to the desired position and released in order to change its position from locked to unlocked or vice versa, wherein the locking mechanism is secured in position by two pins during release, until it is pulled out again. - a base plate comprising: ∘ two rotating surfaces, wherein rotation is enabled by suitable bearings and the surfaces may be equipped with exercise mats of different stiffness, said rotatable surfaces may be locked so that no rotation is possible or unlocked so that rotation is possible; ∘ a locking mechanism for locking the position of rotating surfaces in case their rotation is not required, ∘ at least one bottom attachment site, preferably more, for attaching a fulcrum element (F1, F2) for balance training, ∘ at least one side attachment site, preferably more, most preferably four, for attaching a belt or elastic band for strength training, ∘ two rotating surfaces, wherein rotation is enabled by suitable bearings and the surfaces may be equipped with exercise mats of different stiffness, said rotatable surfaces may be locked so that no rotation is possible or unlocked so that rotation is possible; ∘ a locking mechanism for locking the position of rotating surfaces in case their rotation is not required, ∘ at least one bottom attachment site, preferably more, for attaching a fulcrum element (F1, F2) for balance training, ∘ at least one side attachment site, preferably more, most preferably four, for attaching a belt or elastic band for strength training, - the fulcrum element (F1, F2) to be attached to the bottom attachment sites, wherein the said fulcrum element (F1, F2) may be: ∘ a cylindrical element, ∘ a cylindrical element, composed of two half-cylindrical elements, ∘ a cylindrical element, composed of two half-cylindrical elements and at least one half-spherical element, or ∘ a half-spherical element, and/or ∘ a cylindrical element, ∘ a cylindrical element, composed of two half-cylindrical elements, ∘ a cylindrical element, composed of two half-cylindrical elements and at least one half-spherical element, or ∘ a half-spherical element, and/or - at least one, preferably a set of belts and/or elastic bands (B, E) with different levels of stiffness, which may be attached to the side attachment sites;