A good exercise to isolate your biceps.
Anchor the band to the door with the door anchor over your head.
Facing the door grip a handle in each hand and stand about 3 to 4 feet away from the door. Keep your back straight, abs engaged, head aligned and a slight bend in your knees. Position your arms so that they are straight, pointed towards the door anchor with palms up.
Exhale and pull the handles and bend your elbows until your hands are almost touching your face. Keep your upper arms parallel with the floor throughout the movement.
Inhale and gently return to starting position. Repeat.