The cable triceps pushdown (Vbar) with arm blaster is an exercise that targets the triceps. To perform this exercise, you will need a cable machine, a Vbar attachment, and an arm blaster. Stand facing the cable machine with your feet shoulder-width apart and your knees slightly bent. Grab the. Vbar attachment with both hands and extend your arms out in front of you so that your forearms are parallel to the floor. Place the arm blaster around your upper arms just above your elbows. With your elbows locked in place, slowly bend your arms at the elbows and lower the weight down until your forearms are perpendicular to the floor. Pause for a second, then slowly return to the starting position. Repeat this for the desired number of repetitions. This exercise is a great way to build muscle and strength in your triceps.