My wakeup HR was 48 again. I felt good and enjoyed my two-hour run along the Jordan River Parkway, approximately a 10-mile run. I was only 112 seconds slower on the return than I was going out. That is pretty good consistency in pace for 10 miles (about 22 seconds per mile slower on the return half). The temperature was in the high 40s (F) when I left and in the mid 50s (F) when I returned.
During my first mile, I felt a strange feeling in my left knee. It wasn't a pain, just a low-level "feeling" that I can't describe. Not a scraping or a soreness, just a "feeling". It only lasted for a few seconds and then went away, but it came and went a few times during the first mile. I hadn't done my knee stretches before the run, so at the end of the mile, I sat on a grassy hill and did the exercises. I did have the "feeling" a few times during the next three miles, but only when I first started running after a walking break. I didn't feel it anymore after about four miles. I think the knee was reacting to the stress from yesterday's faster run. If it doesn't come back, I'll be in good shape.
I only carried 12 oz of water with me and drank a swallow or two during each walking break. However, when I returned my urine was darker than normal, so I do need more water for today's weather condition.