Why can a 70-year-old stay in good condition to complete a marathon, while most people half her age couldn't finish?

为什么一个70岁的老人可以保持良好的状态来完成马拉松，而大多数年龄只有她一半的人却不能完成？

Do this, and you'll stay in good condition.

做到这一点，你会保持良好的身体状态。

So, I think a balance should be kept because we want to keep healthy to stay in good condition while doing sports.

所以我们需要平衡因为我们需要在运动中保持健康，保持良好的状态。