| 摘要 |
A hand-held bidirectional torsion spring wrist, hand and forearm exercise device has a pair of handgrip members rotatably joined together to rotate relative to each other in opposed directions about a common longitudinal axis, each sized and shaped to be gripped by a separate hand of a user to impart rotation thereof. An elongate flat rectangular spring member is disposed in the center of the handgrip members and has opposed ends secured to each handgrip member, respectively, and has a longitudinal axis coaxial with the common axis of the handgrip members. The spring member is subjected to a twisting torque force along its longitudinal axis upon relative rotation of the handgrip members in opposed directions to produce a resistive force against relative rotation of the handgrip members in opposed directions.
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