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Stand with your knees bent, legs hip-width apart, hands on upper thighs, and rest your upper-body weight on your arms. Stick your buttocks out to flatten your back. Inhale, then exhale as you draw your transverse in to fifth floor and pull your pubic bone toward your navel, pointing your tailbone down (shown). Hold for a count of 5, then return to the flat-back position. Do 10 tilts. Strengthens abs and stretches lower back.