Breathing properly when exercising is very important. The air enters the lungs and the oxygen in the air is passed through the lining of the lungs. The oxygen is taken up by the red blood cells. The red blood cells enter the circulating blood carrying the oxygen. The blood goes to the heart and is circulated throughout the entire body. The muscles use this oxygen for the needed energy as it is being used will give off a waste product (carbon dioxide). The carbon dioxide (CO2) is in turn released into the blood stream and returned to the lungs to be exhaled.
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