When a major race like the Boston Marathon ends, most people only focus on the finish times. But pro athletes only hit these insane 2-hours-and-change times by being painstakingly exact with splits, running form, and other stats you get from a fitness watch.
So when COROS sent me its Pro runners' Boston Marathon stats like per-mile heart rate, cadence, and effort pace, I knew I had a lot to learn from their approach!
