Breathwork is one of the most underrated tools for improving your fitness. Here are 4 exercises to get started. — We breathe about 20,000 times each day. Air is more important to our survival than food or water. But for a variety of reasons, we don’t always breathe optimally. Unconsciously, we mouth-breathe, tense our stomachs, or just breathe in a shallow, inefficient manner. Without going too deep into the cause…