Apparatus for exercising the abdominal muscles in a sitting position

摘要

The invention is directed to an apparatus for exercising the abdominal muscles in a sitting position, the apparatus including an elastic belt that constrains the abdomen by exerting tensile force and is moved by the user by active muscular exertion; and to a system for detachably fastening the belt to a backrest of a chair, car seat, or the like.