Position: Stand with the arm bent at 90 degrees, elbow tight to the side, hold a cable so that the hand knuckles are pointing towards the anchor of the cable when the arm is next to the body. The anchor point should be at a height so that the cable is parallel to the ground when stretched. Your posture should be exaggerated in attention, spine long, shoulder blades pulled back.
Action: Keep the elbow pinned next to the torso while moving the hand away from the body, stretching the cable. Avoid turning the shoulders or pulling the elbow away from the body.
Coaching point: If you are unable to complete the reps. due to fatigue or the burn, no problem, the exercise is working and adaptation should be quick.