Obsessively logging the mileage.
4.27 miles in 59:57 for an average pace of 14:02; and mile #4 was done in 12:36, so I guess I will call it a short acceleration. Max HR of 80% was achieved at the end of mile 4, but the average for the whole walk was 70%. I walked 1 mile to the park, a little over 2 miles at the park pond excavation site and around the outer edges of the soccer field, then last mile or so home.
Again I chose to go out and walk immediately after eating supper. So far, no sick!
BTW 19 LOL