Abstract: A muscle exerciser intended for compression between the hands and suited to the exercise of, e.g., the muscles of the chest, neck and shoulder region by various compressive movements, the exerciser being comprised of two cup-shaped compression caps suited to fit the palms, two parallel frame flanges on which the compression caps are mounted and anchoring rods placed between said frame flanges so as to keep the frame flanges parallel and to permit a certain length of axial approach of the frame flanges. The gap between the frame flanges is filled by an element of resilient expanded plastic material capable of keeping the frame flanges pushed to their extreme positions and bestowing the exerciser a resiliently yielding movement when the compression caps are pushed toward each other.