This exercise isolates the movement of shoulder extension while lying prone
To do this exercise you will need a mat. Start by lying on your belly with your legs lengthened long beneath you. Inhale to prepare and then exhale as you slide your shoulder blades down your back and lift your arms into the air. Inhale as you lower your arms to the ground and then exhale again as you lift your arms. Repeat 8-10 times
Things to think about
When you slide your shoulder blades down your back be sure that you also widen your collarbones.
As you are doing this exercise imagine movement your shoulder blades and collarbones moving around your ribcage. Imagine fluid movement that is free from the tension of the upper trapezius muscles.