| 摘要 |
A universal variable resistance device is disclosed. The device includes a flexible, resilient rod having a base end for mounting to a stable or immovable object, and a distal end against which a force is exerted to flex the rod. One or more outer rods are coaxially mounted around the rod. Each of the one or more outer rods is configured to extend toward the distal end of the center rod to provide an increased resistance to the force and retract toward the base end of the center rod to provide less resistance to the force. Alternatively, a holder is provided that holds the rod at a point along the rod. The holder is configured to slide toward the distal end of the rod to provide an increased resistance to the force, and slide toward the base end of the rod to provide less resistance to the force.
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