If you've been exercising for a long time, you will still be puffing and panting for a while after you stop. The length of time this is depends on how fit or unfit you are.
This is because the waste Lactic Acid you produce with Anaerobic Respiration presents your body with a problem. You can't breathe it out like you can CO2.
Because of this, it needs to be broken down intopto CO2 and Water. This process requires oxygen, and the amount of oxygen needed is called the Oxygen Debt
Even though the leg muscles have stopped, your heart rate and breathing rate stay high to supply the oxygen needed to repay the debt. The bigger the debt, the longer you'll puff and pant.
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