Slide show: Back exercises in 15 minutes a day
Photos of man practicing bridge exercise
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Lie on your back with your knees bent and your feet flat on the floor (A). Keeping your shoulders and head relaxed on the floor, tighten your abdominal and gluteal muscles. Then raise your hips to form a straight line from your knees to your shoulders (B). Try to hold the position long enough to complete three deep breaths. Return to the starting position (C). Repeat. Start with five repetitions each day and gradually work up to 30.

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