cable standing reverse grip one arm overhead tricep extension

Stand facing away from the cable machine with your feet shoulder-width apart. Hold the cable handle with an underhand grip and extend your arm overhead, keeping your elbow close to your head. Keep your upper arm stationary and slowly lower the cable handle behind your head by bending your elbow. Pause for a moment at the bottom, then extend your arm back to the starting position. Repeat for the desired number of repetitions, then switch arms.