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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There are a bunch of different adaptations that happen.
* The heart and lungs get better at transporting oxygen to the muscles
* The mitochondria in the muscles improve their ability to convert glucose and fat to energy.
* The muscles increase the number of mitochondria in the muscle fibers.
* The muscles get stronger
Those adaptations help the aerobic system.
In addition, there are improvements in the anaerobic system; the body gets better at dealing with the lactate that is generated by the anaerobic system.
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