MUSCLES ENGAGED Shoulders The shoulder is the most movable joint in the body. However, it is an unstable joint because of the range of motion allowed. This instability increases the likelihood of joint injury, often leading to a degenerative process in which tissues break down and no longer function well. Triceps Triceps are an often forgotten muscle group. Triceps are located on the opposite side of the biceps at the back of the upper arm. Well strengthened and defined triceps make the arm look bigger and sleeker (reducing the "flabby arm" look). Equipment Used Resistance Band n/a Exercise Instructions Step 1 Stand on an exercise band and hold the handles of the band in each hand at your shoulders. Step 2 Keep your body rigid as you press the band and fully extend your arms over top of your head. Step 3 Lower your hands back down to the starting position and repeat.