Stand up straight facing a wall.
Place a towel against the wall and hold it in place with the palms of both hands.
Stand close to the wall so that your elbows are bent in by your sides.
Slide the towel directly up the wall with the palms of your hands on the towel.
Ensure you keep your neck long and do not hunch your shoulders.
Stand close to the wall so that you do not need to lean any weight through your arms.
Control the movement as you lower your arms back to the starting position, and repeat.