Patent ID: 8262542

Claim:
A device for strengthening leg muscles having: a substantially flat support surface and an external work surface directly engageable by the foot of a user or by a plate of a drum pedal, said support and work surfaces being articulated with each other at a respective articulation end, so that they can be mutually and angularly moved between at least one compression position and at least one release position, and a front, a back and two flanks, the cross section of said device decreasing in the front-to-back direction, said articulation end being arranged at the back, said strengthening device comprising at least one relief portion at said articulation end thereby resulting proximal to said back and distal from said front, said at least one relief portion: extending towards the exterior of said device from at least one between said support surface and said work surface, being made integrally with the respective support surface or work surface, and and being made of resiliently deformable material, whereby said at least one relief portion is movable between an extended rest position and a compressed position close to a respective support surface or work surface, in which it induces reaction forces which are opposed to the device slipping due to the horizontal component of the compressive force applied to said device by a user, directly or with the interposition of a drum pedal, when said support surface and said work surface are mutually angularly moved between at least one a compression position and at least one release position.