US Patent 7326158 Ball exerciser

A ball exerciser includes a deformable rolling body having an outer surrounding wall surface and at least one lateral mount wall, a rigid stationary coupling member secured to the lateral mount wall and having a stationary coupling end distal from the lateral mount wall, a movable coupling member having a movable coupling end disposed to be swivelable and frictionally rotatable relative to the stationary coupling end about a rolling axis, a grip including a grip segment which is spaced apart from the lateral mount wall and which is coupled to the movable coupling end so as to permit the grip segment to swivel with the movable coupling member.