The Hip Flexor Harness set comes with a "left leg" and "right leg." This is used to connect resistance bands to the back of the knee and thus apply load to the hip flexor when lifting the foot off the ground. Hip Flexor Harnesses come in two sizes (each size is color coded as shown below) to suit a wide range of athletes from 4'7" up to
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I love it and had been waiting for the right time to purchase it.