Standing biceps cable stretch curls

Instructions

Stand back to a machine with a low pulley with a handle.
Grasp the handle with one hand and stand upright, with your back straight, your arm almost stretched and placed slightly behind your back. This is the starting position.
Without moving your elbow, bend your arm to bring your hand close to your shoulder. Only the forearm should move.
Hold this position for one second then slowly move back to the starting position.

Muscles