运动员一定要保持体型。
通过结合这三个因素，拉波波特创造出一个数学公式，这个公式可以让任何体型的运动员知道跑多远和多快才能避免‘速度障碍’。
By combining these factors, Rapoport created a mathematical model of how long and how fast runners of any size can go without hitting the wall.
他们体型健硕，还是运动员，不像大腹便便的丑陋老男人，他们很美，看着赏心悦目。
They are very well-built, they are sportsmen, it's not like ugly old men with a big belly, so they are pretty. It's nice to see.
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