Dumbbell alternate hammer preacher curl

Sit on a preacher bench with a dumbbell in each hand, palms facing your torso and arms fully extended. Keep your upper arms stationary and exhale as you curl the weights while contracting your biceps. Continue to raise the dumbbells until your biceps are fully contracted and the dumbbells are at shoulder level. Hold the contracted position for a brief pause as you squeeze your biceps. Inhale and slowly begin to lower the dumbbells back to the starting position. Repeat for the recommended amount of repetitions.