Stand tall with the resistance coming from behind you and attached to your leg just above the ankle. For the knee extended version, tighten your core, then your upper thigh to ensure your knee is straight. Lift your leg as high as you are able while keeping your knee straight. Also keep your torso upright the entire time. For the knee flexed version, tighten your core, then bring your knee up toward your chest as high as you are able. Continue to keep your torso upright throughout the movement. Repeat as directed.
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