Cable reverse grip triceps pushdown (sz-bar) (with arm blaster)

Attach a straight bar to the cable machine at the highest setting. Stand facing the cable machine with your feet shoulder-width apart. Grasp the bar with an underhand grip, palms facing up, and your hands shoulder-width apart. Keep your elbows close to your sides and your upper arms stationary throughout the exercise. Engage your triceps and slowly push the bar down until your arms are fully extended. Pause for a moment at the bottom, then slowly return the bar to the starting position. Repeat for the desired number of repetitions.