| 摘要 |
A portable elastic type exercising device which may be carried on the person for strengthening and developing the muscles of the arms and limbs, and more especially the muscles of the shoulder, forearm, and wrist customarily used in playing tennis, comprising a single elongated flexible and elastic cord having a loop at one end through which an arm may be extended and a handle of elongated shape having a bore through which the flexible and elastic cord passes to vary the length of the cord between the loop and the handle and to secure the handle in a selected position.
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