If you “cover a lot of ground” it means you did a lot and made great progress.

If you cover a lot of ground at work, for example, you will probably be tired at the end of the day. I suggest a nap.
A cat teaching English? Really?
If you “cover a lot of ground” it means you did a lot and made great progress.
If you cover a lot of ground at work, for example, you will probably be tired at the end of the day. I suggest a nap.