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Aleksandr Sorokin ran 198.6 miles, the equivalent of nearly eight marathons, in a single day. We talked to the athletes and scientists pushing the limits of human endurance to find out why that's so hard to do. It turns out six variables have to be perfectly aligned to break a distance-running world record. They include a metric called VO₂ max, cutting-edge footwear, and the athlete's mindset. We looked at all of them. 00:00 - Intro 01:16 - VO₂ Max 05:06 - Form 08:38 - Footwear 13:04 - Fuel 17:00 - Environment 20:05 - The Mind 24:17 - How Far Can a Human Run? ------------------------------------------------------ #sports #marathon #athletics #pushinglimits MORE EPISODES: Why Fully Self-Driving Cars Are Almost Impossible Why Bringing Back Supersonic Is Almost Impossible Why Living In Space Is Almost Impossible Why Running 200 Miles In 24 Hours Is Almost Impossible | Pushing Limits