1- Grab the cable attachment with an overhand grip at shoulder width with elbows to sides, and back straight and knees slightly bent.
2- Exhale and use triceps to extend arms with the bar down until it touches the front of your thighs level with your upper arm straight and stable next to body.
3- Inhale and return to the starting position until the forearm is close to upper arm, and repeat.
Tips and Advises:
1- The upper arms should always remain stationary next to your body and only the forearms should move, also keep your back straight.
2- A wide grip focuses effort on the long head of the triceps, whereas a narrower grip focuses on lateral head.
3- A pronated grip (palms down) focuses effort on the lateral head of the triceps, whereas a supinated grip (palms up) focuses on long and medial head.
Variation:
1- Triceps Pushdown - V Bar Attachment
2- Triceps Pushdown - Rope Attachment