Cable Tricep Pulldowns (single arm) Start by placing a rope attachment on a cable pulley on the highest height setting.Stand facing the weight stack and grasp the rope handle with and underhand grip. Keeping your back straight, your abs drawn in, and your knees slightly bent, push down your arm down until it is straight. You should feel the stretch in the tricep muscle. Slowly return to the starting position. Repeat for desired number of reps.