Ball says adults should start off with exercises at the base of the pyramid, like walking or climbing stairs.

VOA: standard.2010.02.26

We start walking.

我们开始走过去。

耶鲁公开课 - 死亡课程节选

As the two armies approach each other, I should make it clear, they start out walking at a certain clip.

当两支军队互相接近,我该说得详细一些,他们疾驰前进

耶鲁公开课 - 古希腊历史简介课程节选