它除了有现有的单簧两端连接把手的臂力器的使用功能外，也能做屈肘、收胸的运动。

The four-spring rectangle chest-expander has the function of the existing chest-expander with single spring ends connecting handles, and besides, has the functions of bending elbows and drawing chest.

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从前面观看，四肢行走时并不在一个平行的平面上，而是稍微内收，以弥补腿短与宽胸的缺陷。

Viewed from the front, legs do not move in exact parallel planes, but incline slightly inward to compensate for shortness of leg and width of chest.

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