We have a good check fatigue to guide us. It works as a safety value as a limit to exercise. We can gauge the amount of exercise we should take for best results. Beyond that we begin getting fatigued. When we run or do exercises the breath becomes deeper. There is frequent bringing in of more oxygen into the lungs, which gets absorbed in the blood. Carbon dioxide form the blood gets eliminated in to the air while we breathe out. This increase in breath is called “second wind”. If…
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