| 摘要 |
A harness securable about a user's torso is suspended from a fixed horizontal support through a system of pulleys providing a mechanical advantage in displacing the harness in the vertical direction. A pair of cords having one end anchored with respect to the pulley system and other end depending from the pulley system terminate in a pair of hand grips, respectively. Downward movement of the hand grips produces an upward movement of the harness in correspondence with the mechanical advantage provided by the selected combination of pulleys. Thereby, the user can raise himself and perform various exercises by exerting a downward force on the pair of hand grips equivalent to a fraction of one's own weight, which fraction is dependent upon the selected mechanical advantage.
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