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There is nothing to rejoice too much, as appears next unsportsmanlike symptom - shortness of breath. But this is another time. How to train your legs - Why are some people able to run a marathon is only slightly out of breath, while others cannot go ten steps, so as not to start spitting out light.  Kinobody Shredding Program
 Where does the air when you pick up a bucket of water and carrying it into the house in the country? Why start to choke the very idea that will get off the couch and walk to the store for bread? You can ask the doctors for medical examination. Get a myriad of explanations, the same prescriptions for medications proposal to go to the Caucasus and the recipe of broth was born. But no one would call the main reason - you have weak lungs. Of course, the lungs themselves are neither weak nor strong. This is just shrunken bag of a thin film that separates the blood from the surrounding air, and the tubes of the broom. And it would be correct - weak breathing. Responsible for it intercostal muscles - exhale, back muscles - http://health.reviewship.com/category/muscle-building/

breath with effort (there are passive inhalation), the diaphragm - "belly breathing," the difference in the amount of inspiration and expiration - vital capacity (roughly - chest circumference) and the amount of hemoglobin in Blood. Influencing either of these factors, it is possible to enhance breathing.