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Hello! I am 14 years old and I have been running for almost 3 years now. I haven’t ever experienced leg fatigue before but lately, almost immediately, my legs start to feel so heavy. I often have to quite my run because I can’t move my legs any further. They feel tired and stiff. I do plenty of stretching before. It really messes up my running routine because I plan for 3 or 4 miles and I only end up running. Please help! I don’t know what to do it’s very frustrating.

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