Stretching can help tennis elbow along with strengthen the affected muscle and tendons. Stretching also helps by preventing elbow stiffness and tendon shortening. The wrist flexor stretch is one of the stretching exercises that can help with tennis elbow. Extend the injured arm in front of you with the palm up. Then bend your wrist, pointing your hand towards the floor. With the other hand, gently bend your wrist further until you feel a slight stretch in your forearm. You can hold this position for 15 to 30 seconds and repeat several times. You can also do the wrist extensor stretch by doing the same things as the wrist flexor stretch, but by beginning with your extended hand palm down.