A rotatable exercise apparatus for rotating a user in such a manner that the user's center of gravity is offset with respect to the user's center of rotation, while simultaneously exercising the user's arms, legs, stomach, back, side and neck. The rotatable exercise apparatus generally comprises a rotatable...http://www.google.fr/patents/US5449334?utm_source=gb-gplus-shareBrevet US5449334 - Rotatable exercise apparatus
