This visualization exercise is especially good for smokers, ex-smokers, and those sensitive to or exposed to air pollutants.

Lie down, on the floor or bed, in a comfortable position with knees bent and head supported. You can use a pillow underneath your knees to support your legs. Gently place both hands over your abdomen so you can feel the rise and fall of your belly. Or gently place one hand on your belly just below your ribcage and one hand on your chest.

Clear your mind.

Focus on your breath as it goes in and out of your body. Feel the air come through your nose, down into your lungs, and fill up in your belly. Take slow, relaxed and deep breaths. Breathe in slowly through your nose so that your stomach moves out against your hand(s). The hand on your chest should remain as still as possible.

Phase 1: As you take air into your lungs through your nose, visualize the air that you take into your lungs is clean, fresh, pure, healing, revitalizing air. It has the power to cleanse, center, energize and heal.

Phase 2: Take a slight pause before exhaling.

Phase 3: Exhale through your mouth. On the exhale, clear the lungs of toxins, releasing them from the body.

Phase 4: Take another slight pause before next inhalation.

Practice breathing for 5, 10, 15 or 20 minutes daily.