As you get better, lead and follow happens through more of the body. In the beginning, you move your hands and then we say, "oh it should come from your chest". Then as you get better yet, it goes outward so that you can have the same quality of lead/follow with a thigh push or a foot push and it has almost the same quality as with the center of your body. Lead/follow stops being so localized. The better you get, the more you can get the same quality with any part of your body.

For the leaders ... eventually you don't have to stop the follower, if you move your foot into position early, so the whole thing can flow.