1 mile warm up. 3 min at 10k pace, 1 min recovery, 2 min at 10k pace, 1 min recovery... repeat for about 6 miles. 1.5 miles cool down. I had trouble finding my 6:29 goal pace. Intervals ranged from 6:16 to 6:27 on trail with patches of snow and ice and 6:49 to 7:13 on the un-groomed, lumpy-snow covered sections of trail. Heart rate during intervals was 171 to 173bpm (after the first two). My recovery heart rate was 162 to 166 bpm. This workout wore me out.
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