https://www.theguardian.com/sport/2018/sep/16/eliud-kipchoge-smashes-world-marathon-record-berlin
We are maybe a year from seeing a sub 2:00:00 run. I always thought the rabbit was SUPPOSED to slow you down so you could get the negative split. Also, it feels good to run that way, to “keep a little in the tank” so you can burn it off while you weigh less, sweating and burnint your calories away in a bipedal fire.