>>1010283People who haven't been in heat don't do heat.
I'm kind of a fatass, 5'11 and 210 at 24% bf, but I'm from Texas.
Went out with a marathon runner buddy from Michigan for an 18 mile hike in the Texas summer and he fucking heat catted like 2 miles in.
They say that no amount of being in the heat can acclimate the human body to heat, but I've seen far too many guys from up north in wayyyyyy better shape than me fall out and get heat stroke while I'm still feeling fine.