Beginning guys, it's like, they thrash, they thrash, they get 15 feet up -- and they can do about 15 pull-ups right -- And then they just flame out.
初学者，就是，他们鞭策自己，鞭策自己， 他们爬到了15英尺。 然后他们还可以引体向上15个英尺,对吧？ 然后他们就会累坏了。