Movement:
From the start position (feet wider than shoulder width apart), draw your belly button inward toward your spine. Slowly straighten the legs to just short of full extension. To return to the start position, flex the knees to lower the weight stack, the hips should not rotate upward when knees are flexed. How far the knees extend (returning to start position) will depend on individual control capabilities. Full extension is permissible when controlled. Due to the direction of resistance, beware of hyperextension of the knee. Check knee alignment, stabilize spine and repeat under control. Always be in complete control of resistance. You should be able to stop resistance at any time during the exercise. If stopping is not possible, decrease resistance.