Make sure this fits by entering your model number. STRENGTHEN HAND, WRIST, AND ELBOW STRENGTH: Weak muscles can stop you from giving in your 100% at work. Using a tennis elbow bar to exercise is the easiest way to strengthen up your arm muscles. The extensor and flexor exercises help work everything from your elbow to your fingers, including strengthening your grip. NO MORE TENNIS ELBOWS: Is the fear of getting tennis elbows keeping you away from working hard? Worry no more. Adding a flexbar for tennis elbow to your daily warmup routine will help improve your hand's flexibility while preventing future injuries.