The first 9 miles of this one was roughly a “zone 3” run, which is a bit of a guilty pleasure: neither fast enough to improve my VO2max, nor slow enough for heart rate training, they say that zone 3 runs don’t provide the same physiological benefits of zone 4 (faster) or zone 2 (slower) runs, but sometimes they just feel good! For the next 6 miles, though, I pushed up to a tempo pace somewhere around my goal marathon pace.