Ball exerciser for arms and torso

An exercise ball device for exercising by a user while in a prone position, comprising:

• a) a semi-circular shaped housing having an outer curved surface and an interior curved compartment having an inner curved surface;
• wherein the central vertical axis of said outer curved surface and the central vertical axis of said inner curved surface define a common vertical axis;
• b) said housing having a retaining member positioned on the perimeter edge of said housing;
• c) a rolling ball positioned within said interior curved compartment, said rolling ball being removably restrained within said interior curved compartment by said retaining member;
• wherein said rolling ball has a central vertical axis which is located on said common vertical axis of said inner and outer curved surfaces;
• and
• d) said outer curved surface of said housing having a restraint member attached thereto for receiving the hand of a user.