This is an excerpt from Strength Band Training 3rd Edition by Phillip Page & Todd S. Ellenbecker.
Stand with one foot slightly in front of the other with the middle of the band or tubing under the foot. Grasp the two ends of the band and bring them around the outside of the feet (a). Lift the band out to the side at shoulder level, keeping your elbows straight (b). Slowly return to the starting position.
Alternate lifting right and left arms.
Keep your shoulder blades down; avoid shrugging your shoulders with the movements. Keep your abdominals tight and your wrists straight.