I was tired this evening, so thought I see how long 3 miles would take with my HR under 152bpm. Felt pretty good, but I am still uncertain about whether 152 is the right number. Felt a little lactic acid buildup around mile 1.5, when I first reached peak HR and was running a 6:48 pace. I'll visit the coolrunning discussion forum and see if I can get some advice. My splits:
mile 1: 7:29
mile 2: 7:27
mile 3: 8:03
ave HR: 140
t+1 HR: 136
t+5 HR: 106
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