Ran/walked a tired 60 minutes

I did my short run/walk (still doing 50 seconds of each) of 60 minutes, but I was tired during the whole workout. I did 2.8 miles during the run. I didn't take any rest breaks during the first half, but I took two breaks of about 2 minutes each on the way back. The temperature was in the high 80s, but the sky became cloudy and the wind picked up while I was out. Thunderstorms are expected this evening. My wakeup pulse was 59 this morning, two points higher than last week. I've had two days rest since my long run on Saturday, but they weren't really rest days. Well, Sunday was a rest day, but yesterday was a busy day, and I was on my feet a lot and didn't get an afternoon nap. As I get older, I need more time for recovery.