How our bodies adapt

Here's what happens inside your body when you do aerobic exercise regularly:

1. Your heart gets stronger and pumps more blood with each beat (larger stroke volume). Elite athletes, as I just mentioned, can have stroke volumes more than twice as high as average individuals. But it's not just that. Conditioned hearts also have greater diameter and mass (the heart's a muscle too and gets bigger when you train it), and they pump efficiently enough to allow for greater filli...

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Aerobic exercises are any type of activity that uses oxygen to fuel your muscles. When you engage in aerobic exercises, your muscles and joints send messages to your brain, which stimulates your heart to beat faster and your breathing rate to increase so you take in more oxygen. Because aerobic exercises make your heart work harder, they improve the heart’s ability to pump, even when you are at rest. Any exercise that repetitively uses the large muscles of your arms and legs for a sustained...
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