Execution:
1
Stand beside the machine, holding the high pulley handle with one arm.
2
Keep the torso upright and the working arm at shoulder height, with the elbow pointing out and in line with the cable.
3
Flex the elbow to bring your hand toward your face/alongside your head, with the forearm supinated.
4
Lower slowly until the arm is fully extended, don't let the elbow drop.
Tip: this variation hammers the biceps peak — focus on the contraction, not the load.