increasing your risk if you have to be on any of those consider exercising in airconditioning wait a week if you do get heat exhaustion try to stay out of extreme heat for the next week youre especially vulnerable to a relapse during that time train indoors wait a week part 2 if you train in normal temperatures and know you have a big athletic event coming up in hot weather give your body time to acclimate to it train in that weather for at least a week beforehand looking for a new training regimen try the jason statham workouta new routine that helped the action star drop 17 pounds in 6 weeks more from mens health