Wrap two bands around the lowest portion of a power rack or two poles, with one band per pole.
With your feet shoulder-width apart, bend forward so that your back is slightly higher than parallel to the floor, grabbing a band in each hand with your palms facing each other.
While maintaining a flat back, exhale and raise your fully extended arms upwards and outwards toward your back.
Continue to raise your arms until they are at the level of your shoulders.
Inhale and lower your arms while continuing to keep them fully extended, returning to the starting position.