Working out in high temperatures puts extra stress on your body. High humidity levels are a cause of concern when training. 

Exercising in high humidity levels increases your core body temperature and can cause a decrease in performance.

"High schools and colleges have athletic trainers that measure turf. So if they're outside, a typical indication of ending practice time is anything over 105-110 degrees," said Erie Sport's Now Director Tyler Travis. "If you get into practice and the athletes aren't tolerating it very well, it's a good idea to make sure that safety is first and either shorten practice or end practice."