IIRC,Shep Smith is from Mississippi,he ought to be used to 100 degree weather and humidity in the 90% range. Although I've lived here all my life and I can't even get used to the humidity.
I grew up in Hattiesburg in my mid-teens, walked 36 holes a day just about every day in the summer, changed shirts at lunchtime, drank water like crazy but it really didn't phase me.
I go back now to my in-laws house, walk outside, take one breath of air and say, "I might can go 9..."