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The muscles in your legs are building up. If you're under the age of 20 , your bones mass is yet building. If you're 20 and up it should not hurt or feel heavy because your bone mass is already built!

Tip: Drink a lot of milk!

Hope this helped

- Simmy Gill - 13 years old - Rep soccer

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Q: My legs feel heavy after playing soccer hard to run fast sometimes Why?
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