Sitting with legs in front, cross one foot across the opposite knee. Keep your hands on the floor behind you to avoid falling over. Slowly walk the front foot in, bending both legs, and bringing the knees up towards your chest. Use your arms to lift you, pushing your chest forward. You should feel a stretch through the hips and buttocks. Hold for 10-20 seconds and breathe deeply. Then face the other way and stretch the opposite side.