MUSCLES ENGAGED 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 Cable Machine The cable machine is a piece of equipment used in weight training or functional training. A wide variety of exercises can be performed using the apparatus. Exercise Instructions Step 1 Start in a split squat position with a deep bend in your knees and your chest positioned over top of your front leg. Hold the cable with both hands with your arms held up beside your head. Step 2 Extend your arms and fully contract your triceps at the end of the motion. Step 3 While maintaining rigid stance, return your arms back to the starting position and repeat.