How does anaerobic activity “not use oxygen” if you’re breathing very heavily when you do it?

Question

How does anaerobic activity “not use oxygen” if you’re breathing very heavily when you do it?

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Answer 1

When you’re doing anaerobic activity, your muscles use up oxygen faster than your body can supply it, so you begin to breathe heavily in order to get more oxygen into your system. However, because you’re not getting enough oxygen to supply your muscles, your body creates energy by burning sugars and carbohydrates instead of oxygen. This produces lactic acid which causes your muscles to feel sore after doing anaerobic activity.