By Gabe Mirkin, M.D. Just about everyone with an unobstructed nose will breathe through their nose when at rest or during casual activities, but most people will breathe through their mouth during exercise. The more intensely you exercise, the more likely that you will have to breathe through your mouth because you may not be able to get enough air through your nose to feel … [Read more...] about Should You Breathe Through Your Nose or Your Mouth When You Exercise?