Some of the problem is the general feeling made up by a rider that may think they have collection and sometimes it is a trainer/coach's fault in not properly describing it.
When I talk to a "trainer" I can determine instantly if they even understand what it is by their answer so I have a question for everyone...
If you were a trainer, describe collection's FEEL to a rider (not how it should look, but how it should feel ). Use either what you know or what your trainer/coach told you.
Again describe the feel, not the look.