Just got back from jogging 5K around the neighborhood in the heat of the day. Heat Index was 89, which was hot but not too terrible, and still mild compared to what I will be racing with on Sunday. If I didn't have that race coming up and need to get a little more heat acclimated, I would have waited to do it in the cool of the day. If it had been longer I would have carried water. I went at a comfortable pace and wore my heart rate meter and checked it often.
Some idiot was out there running in one of those old-fashioned plastic sweat suits. That's INSANE. All that will do is get a person dehydrated and hyperthermic. I know of no legitimate use for them, with the possible exception of training for the Badwater Ultramarathon.
I think I just rolled my eyes a little and said, "Jeez, good way to get heat stroke."
He didn't answer. Probably too close to passing out to talk.