Breathing correctly is an important but often forgotten part of exercise. Forgetting to breath, breathing at the wrong time, and breathing the wrong way can make your workout less successful than it would otherwise be. Crocodile breathing is a great way to retrain yourself to breath correctly.
Begin by lying face down with your forehead resting on your forearms. Breath in through your nose and deep into your belly. You should feel your stomach push out into the ground and your lower back rise and fall as you inhale and exhale. Continue this pattern for about five minutes and you will be well on your way to breathing correctly throughout your exercise. It's super simple and has the added bonus of increasing your shoulder and upper back mobility.