You burn yourself out by working too hard.

你工作过于努力，正在消耗自己。

We didn't really know how to train in modern terms, and there was this thing called “burning yourself out, ” and I didn't want to burn myself out at 18.

在现代来说我们不知道如何训练，有这句话叫做“燃烧自己”，18岁时我不想烧自己。

And if you do it from the very beginning and try to keep that up for the next hour that you're hoping that you can exercise, you're really going to burn yourself out.

如果你从一开始就这么做，并试图在接下来的一个小时里保持这种状态，你真的会耗尽自己的精力。