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Fit people can run and jump, but they don't get too tired. I'm fit. I breathe in and air goes into my nose or mouth. It goes down into my lungs. Lungs are like bags. They get bigger when I breathe in. They get smaller when I breathe out.

Breathe in and out. Watch your chest go up and down!

Your body needs exercise. I exercise every day, so I'm very fit. John is fit, too.

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Exercise is good for your muscles, but don't exercise too much!

Sarah has exercised too much, so her muscles hurt.

Your body needs rest and sleep, too!