Exercise makes the heart muscle stronger, allowing it to pump more blood with each heartbeat. The heart needs to beat less frequently at rest than it would in a less fit person because more oxygen is delivered to the muscles.
If an athlete were to compare their resting heart rate to the general population, it might be deemed low. The heart rate of a young, healthy athlete may range from 30 to 40 bpm. That's probably because exercise makes the heart muscle stronger. With each heartbeat, it can pump more blood thanks to this.
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