How to do it

1. Lie on a bench under a cable machine, holding the cable bar with an overhand grip.
2. Extend your arms straight up, keeping them perpendicular to the floor.
3. Bend your elbows to lower the bar toward your forehead, keeping upper arms stationary.
4. Extend your elbows back to the starting position without locking them out.
5. Repeat for the desired number of repetitions while maintaining control.