5 Mile Hot Run

Afternoon run, HOT out, 90F at the start, cooling to 87F when we got home, but humidity didn't feel too bad. Ran up at the lake, starting at the lower lot and going counter clockwise, then returning so I could run in the shady part as much as possible. Walked half mile before and after to stretch out the time a bit. First 3 miles were all right, 10:07, 10:27 and 10:52 with typical scheduled walk breaks. But my heart rate kept getting over 175, so for mile 4 and 5 I basically alternated running/walking, heart rate would get over 175, I'd walk for a minute, then run a bit, etc. 11:36 and 11:17 for the final two miles, overall pace of 10:52, AHR of 168, but max of 179, and not a very smooth run with all the walking. Might need to rethink the afternoon Wednesday run idea, bleh.