It is true that the highly intense exercise the body burns glucose anaerobically. It is the exercise that break down the glucose for energy without using energy.
In a short period of time, glucose is not completely broken and it does not convert into energy. During exercise when body works it needs more energy to work and there is less supply of oxygen, then muscles drive energy from anaerobic respiration.
During anaerobic exercise, body produces lactic acid and this is because the muscles get tired after the energy burst.
Respiration is the movement of oxygen from the outside environment to inside the cell.
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