1
Stand facing the cable machine with feet shoulder-width apart, knees slightly bent, and core engaged. Position yourself at an appropriate distance from the machine so the cable is taut at arm's length with a slight bend in the elbows.
2
Grasp the cable handle with an underhand (supinated) grip at shoulder width. Keep your chest up, shoulders back, and upper arms stationary against your torso throughout the movement.
3
Slowly lower the handle by extending your elbows in a controlled manner, allowing the weight to pull your arm toward full elbow extension while maintaining tension on the biceps. Keep the upper arm fixed and only move at the elbow joint.
4
Curl the handle back up by flexing your biceps and driving your elbows upward, bringing the handle toward your shoulders. Squeeze the biceps at the top of the movement for 1-2 seconds, then return to the starting position with control.