(This powerful shoulder opener helps engage and strengthen the muscles of the back in order to support the opening of the chest.) Lie on your belly and clasp your hands behind your back. On an inhalation, lengthen your upper body forward and lift your chest, and heart, off the mat without raising your legs. Exhale and scoop your tail-bone under, engage your belly, and extend out through your legs as you lift your arms up and behind you. Continue to lengthen the sides of the body as you keep your shoulder blades rooted on your back, and shine out through your heart.