Stand facing a cable machine with a V-bar attached to the high pulley. Grasp the V-bar with a neutral grip (palms facing in) and keep your elbows tucked close to your sides. Extend your elbows to push the bar down until your arms are nearly straight, squeezing your triceps at the bottom. Slowly let the bar rise back to the start under control, maintaining tension on the triceps throughout the movement.
Log your cable triceps pushdown (v bar attachment) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.