I was thinking over the weekend that I'd use my marathon plan to take me up to a long run of 15 miles. The plan isn't very different from what I'd planned to do anyway, and it would give me a sanity check on the numbers in the plan. The 8 miles I did last week is the same distance as week 3 of the plan, so today I started with week 4 and did a very enjoyable 8.8 miles. My wakeup HR was 51, and I felt great before, during, and after the run. The temperature was 27 (F)when I left about and 35 (F) when I returned. Next week is a fall-back week to 7 miles.