Stand with feet shoulder width apart, secure a light band underneath the foot of your working arm. Extend your arm out to your side, take any slack out of the band, so that your starting position is about hip height.
Keeping the arm straight, wrist neutral. Engage your lat and flex your shoulder to raise the band. Keep your shoulder depressed, don't allow it to shrug upward.
Pause at the top, your arm parallel to the ground, wrist in line with the shoulder.
Lower slowly with control. Repeat for repetitions.