This is the type of breathing we are exposed to via conventional fitness methodologies. This involves inhaling and pressurizing on the eccentric part of the movement and exhaling during or at the top of the concentric part of the movement. Breathing in this manner creates pressure in the thoracic cavity which protects the spine. This method is best used when lifting maximal weights and/or acclimating to a new exercise.
Example: Squat – inhale on the way down and exhale on the way up. Note: those with high blood pressure should check with a doctor before using this type of breathing.
Anatomical (Matching) breathing
Anatomical breathing is performed in a manner opposite of what is outlined above and is ideal for high repetition lifting over longer durations of time.
Example – performing the competition lifts for a 10 min time period. Breathing in this manner has been shown to help control heart rate and thus improve performance. In the exercise section, we will outline how you should breathe during each portion of the lift. For the time being though, it’s important to note that breathing correctly is a BIG deal. This has a dramatic effect on your performance and safety if done correctly or incorrectly.
Steve Cotter on Breathing during the snatch << link