Pulling on the training line not only controlled the speed at which a movement was trained, but also provided resistance that was proportional to the kinetic chain of the movement. Adjusting the resistance was easy and in a few seconds one could go from ounces to hundreds of pounds. In testing the E xer-GenieĀ® Exerciser, Scientists, Researchers and Coaches discovered that resistance was generated by winding the specially woven nylon training line around the smooth chrome plated metal shaft.
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