Day 2 of my low HR program. more stable HR today - kept it at 137-140 between miles 1 and 3.9. For some reason, my HR spiked to 151 with an eighth of a mile to go. My HR at t+1 was 139, and 96 at t+5. My splits:
mile 1: 8:30
mile 2: 8:00
mile 3: 8:20
mile 4: 8:50
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