1) Sit or stand straight.
2) Place your left hand over your navel and your right hand over your chest.
3) Inhale slowly - through your nose. Your nose has filters that help to clean the air you breathe in. When you inhale, your stomach should expand outward like a balloon. Your right hand on your chest should barely move.
4) Exhale through your mouth, emptying the lungs. When you exhale, your stomach should flatten.