Stand upright with your back against the wall, feet shoulder-width apart, and your arms in a cactus position with palms facing out. Keeping your arms pressed into the wall, lower your elbows as far as possible. Hold for a moment, then slide your arms up the wall as high as they will go without losing contact with the wall. When you start to lose contact, bring your arms back to the starting position. Repeat the cycle for 30-60 seconds daily.