Start seated with your feet slightly wider. Dive your hands between your knees to the floor and then while pressing your heels in to the floor and using your legs raise your arms up over head looking at the ceiling and extending your back. Start to drop your arms to the side, pressing the behind you to help you feel a stretch in your chest. Repeat as it feels good. Try to get smooth and fluid with this. Continue to breath comfortably and even work on exhale on your dive through your knees and inhale as you lift up overhead, exhale as your drop your arms. This can help control and attention so you don't stay tense through the movement.