"To reap the most benefit from your physical training, you need to train your body to do more with less. To do this, you’ll need to reduce your air intake. Incorporating this concept into your training will result in an improved breathing economy and an increase in your athletic performance, along with reduced breathlessness and lactic acid during competition. More importantly, you will not need to push your body beyond its limits, reducing your risk of injury, cardiovascular, and respiratory problems and other health concerns.
Nasal breathing during physical training ensures that you do not push yourself beyond what your body is capable of doing. In addition to nasal breathing breath, breath-holding techniques are very beneficial to athletes. When you purposefully subject your body to reduce oxygen intake for a short period of time, the kidneys increase the production of EPO: a hormone that promotes the formation of red blood cells, and the spleen releases red blood cells into the blood circulation."
