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Stand up and reach your arms straight out to your sides. Bend your hands back at the wrists while simultaneously moving your arms behind you as far as they'll go. Hold for five counts, then bring your arms back in line with your torso. You may feel tension in your shoulders, forearms, and wrists, indicating you're stretching muscles needed for tasks as diverse as driving, typing, and hoisting heavy loads. Daily dose: One or two sets of ten.