The reverse grip cable curl with a bar attachment targets the biceps and forearms, promoting balanced arm development and improved grip strength. This exercise uses an overhand grip to shift the focus onto the brachialis and brachioradialis muscles.

1. Attach a straight bar to the low pulley of a cable machine.
2. Stand facing the machine, holding the bar with an overhand grip.
3. Keep your elbows close to your sides and curl the bar towards your shoulders.
4. Squeeze your biceps at the top of the movement.
5. Slowly lower the bar back to the starting position.