| 摘要 |
An exercise apparatus for developing flexibility and strength in the back uses a captured ball to support the user's body. The ball is mounted in a receptacle with a substantial portion of the sphere exposed for contact with the user's body. The sphere has universal movement in the receptacle. In use, the user sits or lies on the ball in contact with the exposed sphere and their feet on the floor or a foot rest. The body is exercised by maintaining a point of contact between the ball and the user's back.
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