Place a preacher bench about 2 feet in front of a pulley machine.
Attach a straight bar to the low pulley.
Sit at the preacher bench with your elbow and upper arms firmly on top of the bench pad and have someone hand you the bar from the low pulley.
Grab the bar and fully extend your arms on top of the preacher bench pad. This will be your starting position.
Now start pilling the weight up towards your shoulders and squeeze the biceps hard at the top of the movement. Exhale as you perform this motion. Also, hold for a second at the top.
Now slowly lower the weight to the starting position.