Patent ID: 7306550

Claim:
A fitness ball comprising: an annular body having an internal air-filled space, said annular body having an annular outer surface and a central hole, said central hole having a first wide end opening at a top of said annular body and a second wide end opening at a bottom of said annular body, said central hole having a narrow area between said first and second wide ends, said air-filled space having a cross-sectional diameter that is greater than a cross-sectional diameter of said narrow area of said central hole; a first protruding ear extending outwardly from one side of said annular body, said first protruding ear having a through hole formed therein; a second protruding ear extending outwardly from an opposite side of said annular body, said second protruding ear having a through hole formed therein, said first and second protruding ears being coplanar to each other; a first pull string threaded through said through hole of said first protruding ear; and a second pull string threaded through said through hole of said second protruding ear.