Breathing through your mouth expands your chest, but if you breath through your nose you'll notice how your abdomen extends. You see, nose-breathing causes the diaphram to pull air to the bottom of your lungs. This delivers a good dose of oxygen into your bloodstream and brain. It also tends to relax you.

Breathing through your nose is healthier, and it's the basis of this one-minute meditation. You simply close your eyes, let the tension go out of your muscles, let go of your thoughts (to the extent possible), and take four slow, deep breaths through your nose, paying attention to your breathing.