Primary Muscle Group: Back of upper arms
Muscle Groups Worked in This Exercise: Triceps brachii (lateral and long heads) and that seldom heard of muscle, Anconeus
Preparation: Sit on the ball with your feet flat on the floor. Place the band under both feet and grasp an end in each hand.
Breathing: Inhale as you bend your elbow, and exhale as you return to start position.
Execution: Extend your arms overhead with palms facing each other. Remember to keep your abs engaged to reap the full benefits. Bend your right elbow and lower your hand behind your head and inhale. Exhale when you raise your hand back to starting position. Now bend your left elbow and repeat the lowering/raising motion. Continue to alternate both arms for all reps.
Comments: Alternating your arms, you'll work them twice as hard. Just imagine how fast you'll whip those "tri's" into shape.