Its very important, you instructors.
Make the movement or skill you're trying to teach clearly visible. Teaching flexion extension? Get your butt on the ground when you flex, and be on your toes when you extend. Angulation? Your inside oblique should be ripping, and your outside oblique should be smashed. Counter? Better be almost looking behind you. Just a few examples, but you get my drift.
If you exaggerate a movement to 200 percent of what you want the student to do, you'll be lucky to get 50 percent out of him or her.
Takes added skill to exaggerate movements to this degree beyond ideal. Practice, practice, practice, my friends!