How exactly does physical exercise make our immune system stronger?
In: Biology
Basically, stronger is stronger. No one part of the body improves without dragging the rest along with it. Run alot and your legs get stronger, but so does your heart, lungs, and blood vessels. Also your holding your arms up while you run so they are getting stronger, too. The reverse is also true. Gain fifty pounds of lard. Your knees are carrying more weight, heart is being strained, etc.
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