Grasp the rubber ball on the low-pulley cable and align your working-side shoulder with the weight stack. Bend over until your torso is almost parallel to the floor, raise your upper arm so it’s level with your torso and keep it presses against your side. Holding your upper arm in place, extend your elbow to move your forearm up and back. Squeeze he triceps at full-arm extension, then slowly lower to the start position. Repeat for reps, then switch arms.