Sharon Gayter’s closely monitored world record reveals insights on marathon fueling, pacing, and strategyOutside's long reads email newsletter features our strongest writing, most ambitious reporting, and award-winning storytelling about the outdoors..In November 2017, , a 54-year-old British ultrarunner, completed ten marathons in ten days on a treadmill, with a combined time of 43 hours 51 minutes 39 seconds, breaking the former Guinness World Record by more than two hours. What’s important about Gayter’s feat now—besides being an impressive mark —is that she ran all ten marathons in the...…Sharon Gayter’s closely monitored world record reveals insights on marathon fueling, pacing, and strategyOutside's long reads email newsletter features our strongest writing, most ambitious reporting, and award-winning storytelling about the outdoors..In November 2017, , a 54-year-old British ultrarunner, completed ten marathons in ten days on a treadmill, with a combined time of 43 hours 51 minutes 39 seconds, breaking the former Guinness World Record by more than two hours. What’s important about Gayter’s feat now—besides being an impressive mark —is that she ran all ten marathons in the...WW…