I ran 5 miles on the Jordan River Parkway and had a good run! I took 16 oz of water and had just 3 swallows left at the end of my run. The shade temperature was 77 (F) when I left home and 91 when I returned. My wakeup heart rate was 54.
I felt pretty good during the run. During the first two miles, while I was warming up, I took frequent but brief walking breaks. I also took them during the last mile or so due to the heat. Some runners want to run without walking and they push themselves too much. My philosophy is to walk when tired. The big factor today was heat, and I don't want to compete with the sun, so I walk when I need to cool off a bit. I prefer to save my energy to overcome distance not heat.