[Obesity Discussion]

Very simple.....the less dense air is, the less oxygen each breath you take contains. Well, hot air is less dense than cool air. So which each breath of hot air you're getting less oxygen than when it's cool out. Same goes for humid air....water molecules replace some of the oxygen molecles in air, so if it's humid, you're breathing in less oxygen than dry air.

Just so happens it's been a bit humid and still hot outside, so double whammy.


Don't forget to hydrate yourself a little extra when you're exercising in the heat! Your body will sweat more and needs more hydration to replace it!