| 摘要 |
<p>An exercise machine includes a first elongated housing having an endcap at a first end and a hollow interior portion. A second elongated housing is slidably positionable within the first elongated housing. A spring having a progressive resistance force is positioned within an interior portion of the first elongated housing between the endcap and an end of the second elongated housing. The spring is compressible between the endcap and the end of the second elongated housing and provides a progressive in-line resistance to achieve a contractive motion from a semi contracted or hyper extended position from both push and pull positions.</p> |
