Sprinting, Acceleration

Athlete 12,
Do not be concerned that you feel tired after a 40m sprint.
At 12 years old the most important thing is to enjoy your ability to run fast which, judging by your posted times, you are very capable of doing.
It is expected that after a flat out sprint that we will feel tired - thats perfectably normal.
At the moment your typical race distance for sprinting will be 60m or 150m. To build endurance for this distance of races at your age you need to be taking part in sessions typically 1000m to 1250 meters in length. Stuff like 5 x 250m off 4 to 6 mins recovery. Or pyrimads like 75, 100, 125, 150 and 200m then back down again. These should be run at 90 to 95% of your 200m sprint speed.
You are still quite young with a long time to improve your speed.
Join a club and find a coach. Enjoy your ability to run fast.

Hi buddy,i am pretty sure that you are getting tired after 40 meters because you must have to improve your running technique.If you are running with awong form , you are doing extra force to move your body fast.So,Try to work on that using or practicing sprint drills to correct your form. This will take you some time, so be patient,you are only 12, try to learn the correct technique first and after that and with more age work on your speed endurance.

wel dun on your times m8, im 12 too.
i run the 200m in 26.00 but the 100m in 13.28 so im the other way round. i would say u shuld focus on watever race u are in and dont worry about eny1 else. just concentrate on crossing that finish line!

d