Begin in a comfortable seated position on your mat, with your legs crossed and your spine straight.
Extend your right arm up toward the ceiling and bend it at the elbow, bringing your right hand behind your head.
Reach your left arm behind your back and bend it at the elbow, bringing your left hand up between your shoulder blades.
Clasp your hands behind your back, trying to touch your fingertips together. If you can't quite reach, you can use a strap or towel to bridge the gap between your hands.