This will help you relax
Reach your right arm straight up, bend your elbow, and let your hand fall behind your head. Move your left arm behind your back and bend the arm, letting the back of your left hand rest against your right shoulder blade (or as close to it as possible).
Reach to grab your right fingertips with your left hand. Repeat on the other side.
Make it easier: If you can’t reach the fingertips of the opposite hand, use a towel to assist, creating a bit of tension by gently pulling on the towel in opposite directions.