When I'm talking about marker training, I have a marker. Could be my hand, could be a ball on the end of a stick, could be something on the floor, depends on what I define as "marker" or "target". And then use that to lure the animal into positions, like "sit" or "down" or "circle" or whatever. And clicker is what I use to confirm the correct action.
I just mix in whatever works best for what I'm doing/needing...