Why is it that I feel tired when I sprint?

Ares

New member
I am doing Track... I do Shot Put, Discus, 400 and sometimes 100. I am NOT a sprinter. I do 400m at the Games though. I did it once in one game. I came in 2nd place. I remember my legs where killing me and sereval days after that it still hurt. I didn't see a Doctor. I remember practicing the 100, but when I sprinted no even 30m, I became tired? WHY IS THIS? SHOULD I SEE A DOCTOR? WILL I EVER BE ABLE TO SPRINT AGAIN?

Here is some backround Info:
I am 13 years old.
I am 6'1.
I weigh around 150 pounds.

EASY 10 POINTS!
 
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