| 摘要 |
An exercising device can be used for fun and for aerobic exercise. A rebound board is placed against the pelvic area of a person, and a ball is tethered to the board by a stretchable tether. The person can somewhat bounce, bending and straightening the knees, with consequent movement of the hips causing the ball to bounce rhythmically on the rebound board. More or less energetic movement of the hips renders the exercise more or less strenuous, and weights can be held in the hands to increase the stress.
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