I have gotten heat sick twice this summer. Mostly because I'm dumb and underhydrated. Both times I have woken up and my body temperature is raised, I have a head ache, and I still that way for most of the day. I have been lifting almost everyday, biking on my nordic track for 20-40 minutes everyday and a 30 minute walk outside everyday even if it's hot. I am pretty sure this second time made me realize I'm not twenty anymore, beer is not a okay oh high exertion days, and to take better care of myself.