Slide show: Back exercises in 15 minutes a day
Photos of man lying on back, rolling knees side to side
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Lie on your back with your knees bent and your feet flat on the floor (A). Keeping your shoulders firmly on the floor, roll your bent knees to one side (B). Hold for five to 10 seconds. Return to the starting position (C). Repeat on the opposite side (D). Repeat each stretch two to three times — preferably once in the morning and once at night.

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