How does aerobic exercise help prevent cardiovascular diseases?

Aerobic exercise boosts your high-density lipoprotein (HDL), the "good," cholesterol, and lowers your low-density lipoprotein (LDL), the "bad," cholesterol. This may result in less buildup of plaques in your arteries.

Explanation:

Regular aerobic exercise improves your cardiovascular fitness by increasing your capacity to use oxygen. It does this by increasing your heart's capacity to send blood (and hence oxygen) to the muscles. ... This is evident in a slower resting heart rate, and a slower heart rate for the same exercise intensity.

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