Funny enough stumbled across the broadcast of the last mile or so last night. Didn't realize what I was watching until I noticed the car in front of the pack dragging a green bar. He made it look easy. After he crossed the finish line he grabbed a flag and started running back down the course. Probably could have run another 10 miles at that pace. WTF
A fascinating read about the science used in this attempt: https://www.bbc.com/sport/athletics/50460861