ok i am 14 as u see in the question and in athletics we have to run a 400m and a 200m in like 60s and i can't finish it without getting sick all over myself so i want to raise my stamina or endurance so i can at least finish and not puke and hopefully finish the 400m in time and i have to run it every other day the next time i run it will be monday and then i have the rest of that week off then i think the next monday the 1st if December