Lie on your back with your knees bent at a 90-degree angle and your feet off the floor.
Tighten your belly muscles and buttocks, and press your lower back to the floor. Keep breathing normally and don't hold your breath.
Slowly straighten one leg, and hold that position for about 6 seconds. Your leg should be about 12 inches off the floor. Bring that leg back to the starting position, and then straighten your other leg. Hold that position for about 6 seconds, and then switch legs again.
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