STARTING POSITION:
Select the appropriate strength of the band. Sit down on the floor with your feet together in front of you and your knees slightly bent. Grab the band with a neutral grip and place it behind your feet to tighten it. Make sure your torso is at a 90º from your legs. Contract your pelvic floor and core while keeping your chest up. The band should have tension from the beginning of the movement.
MOVEMENT:
Lift the right arm just above your head while you exhale. Make sure you don't bend your elbow. Return to the starting position in a smooth movement while you inhale. Repeat the movement for the specified amount of repetitions, then switch sides and repeat the exercise.
TIPS: While your are doing the exercise, move only the arms, make sure you don't move any other part of your body. The exercise key is quality over quantity. The trick is to perform the exercise using proper form.