I was doing some exercises down on the floor when she walked in.

问题描述:

I was doing some exercises down on the floor when she walked in.
请特别说明一下DOWN在这里的用法,

DOWN在这里作副词,是“在地上”的意思,和on the floor一起作句子的状语.
这句话意思是:当她走进来的时候,我正在地上做运动.(可能是瑜伽什么的吧.)