Mystery #3Tier 2fitness and training
Why does doing sport again and again slowly make you fitter and stronger?
The first time you try a sport it can feel impossible, but do it week after week and slowly it gets easier. Your muscles do more, your lungs puff less, you can keep going for longer. Why does repeating exercise make you fitter and stronger?
Your guess
How do you think your body changes when you exercise over and over?
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