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Exercise is good for you, but what exactly
does it do to your body? Let's find out!
The heart does more work than any other
muscle in your body. It beats about 100,000
times a day! When you exercise, it beats faster
because it has to send more blood to your
muscles. This makes your heart stronger
and you get fitter - you don't get tired quickly
and you have energy. Your muscles get bigger
and stronger. You can move, run and carry
heavy things more easily.
What about the rest of your body? (Ktoś przetłumaczy plsss)​