Cable lying bicep curl

Attach a straight bar to a low pulley cable machine. Lie face up on a flat bench with your feet flat on the ground. Grasp the bar with an underhand grip, hands shoulder-width apart. Extend your arms fully, keeping your elbows close to your sides. Keeping your upper arms stationary, exhale and curl the bar up towards your shoulders. Pause for a moment at the top, squeezing your biceps. Inhale and slowly lower the bar back to the starting position, fully extending your arms. Repeat for the desired number of repetitions.