5k Math

Over the last several years, I’ve taken my weight before a 5K race and logged the time. After 12 measurements, it looks like I can get a good, conservative prediction of my time from my weight: weight x 7.5 = seconds to complete 5k. To put it another way, for every 8 pounds lost, there is a corresponding decrease of ~1 minute of time to run the 5k. Once a sub-10% body fat weight is achieved, it may be possible to bring down the 7.5 number to ~7, but prior to that I think the best way to get faster is to lose weight.

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