Raymond Wu

“Right before doing an exercise, take a few deep breaths to prime your body with oxygen and to get rid of some extra carbon dioxide. Then, breathe out as you contract your muscles and start the exercise. Focus on breathing regularly as you continue doing the exercise. If the exercise is so intense that you can't breathe regularly, take shallow breaths instead.”
― Raymond Wu, The One Minute Workout: Build Fat-Burning Lean Muscle, Massive Strength, and Better Health in Just 60 Seconds a Day!