Slide show: A guide to basic stretches

Your shoulder's internal rotators are part of the group of muscles often used in overhead sports activities, such as a tennis serve or an overhead throw. To stretch these muscles:

• Grasp a rolled-up towel firmly with both hands, as shown.
• Gently pull the towel toward the ceiling with your top hand. You'll feel a stretch in the shoulder of your opposite arm as your lower hand is gently pulled farther up your back.
• Hold for about 30 seconds.
• Switch hands and repeat.