While most runners know how fast they can run a mile, very few of us would be able to say how fast they are at 3.73 miles or 8.06 miles. And in case you’re trying to do the math, that’s 6K and 13K. And good luck at that math because I couldn’t figure it out. Those strange equations and distances are exactly what you are challenged to conquer at the 2020 Winter Predictor event in…