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Chapter 21 An Early Romp.

Which makes you more tired, to walk slowly, just "lagging along," for about twenty minutes, or to walk briskly for the same time? Why?

How do you make your muscles strong? What is your heart made of? How can you make your heart strong?

Why do you need a heart?

What is your pulse? Where can you easily feel a pulse? Count the pulse of someon

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