Attach a handle to a high cable pulley and stand with feet shoulder‑width apart, facing away or slightly angled from the machine. Grasp the handle with one hand, keep your elbow close to your head, and stabilize your torso. Extend your arm forward by straightening your elbow until your triceps are fully contracted. Slowly return to the starting position with controlled motion, keeping your upper arm stationary throughout. Complete all reps on one side before switching to the other.
Log your cable standing one arm triceps extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.