Lie on your back with your knees bent and your feet flat on the floor.
Place your hands on the lower part of your stomach.
Take a deep breath in through your nose, taking the air right down into the base of your lungs.
You should feel your stomach push out against your hands.
Breathe out through your mouth, gently tensing the stomach muscles under your hands until your lungs are completely emptied.
You should feel your stomach push out into your hands as you inhale, and pull inwards as you exhale.
Repeat the deep inhaling and exhaling.