| 摘要 |
An ultra light but resistive ball device for exercise is provided comprising: a flexible sheet with least one preliminary broken section of collapse for allowing contraction of the sheet under bias about at least one flex point in response to an exertion of hand grip. The sheet has two free ends extending substantially half the circumference of the ball and partially folded back on the sheet. Two lateral apertures are located at opposite ends of the free ends to permit an uninterrupted collapse of the sheet. A sheath envelopes the sheet to provide a slip resistant exterior surface for grasping the ball.
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