| 摘要 |
The present invention relates to the field of knee down push-pull assistive exercise with a compact mobile exercise machine that exercises the abdominal, back and arm muscles in the kneel-prone-kneel movement. The push-pull tractor has a roller in contact with a random supporting surface, a handle offset to the roller axis to support a portion of operator body weight and an energy storage device that returns the tractor towards the starting position. In several embodiments, a wheel is added to the tractor to counteract windup torque energy.
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