It makes sense that legs get stronger and build muscle, making cardio easier. But how does cardio make it easier to breathe and run longer distances before becoming fatigued and winded?
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heart and lungs are muscles too. Cardio exercises those muscles. Your body also adapts to the higher demand by finding ways to operate more efficiently. Unfortunately your body will only be as efficient as it has to. So stop working out and it will go back to the lazy way.
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