Start from the shoulder height in front of your body and lift the arms up above the head as far as your body allows you to. Breathe in as arms are down, exhale as you move your arms up. Do not allow your middle back to arch, keep your core engaged.
Keep the towel above the head and pull it down and behind the head. At the same time, pull the hands apart stretching the towel.
This exercise is fantastic to get rid of so-called bra fat. Lean forward, to try and get your body as parallel to the ground as possible. Place the towel behind the back, inhale and bend and extend the arms. Try to your elbows as close to the body as possible.
This exercise to similar to the previous except you are moving up and down, hold one hand behind the neck and the other middle of the back and imagine you are trying to dry the area between your shoulder blades. Extend and bend your arms with a minimal movement of your elbow.