In my one and only spin recovery training session it was only the first time the instructor demonstrated a spin that it was a real shock. By the second or third time it had reduced to being just thoroughly unpleasant!
I found myself naturally recovering from the spin before it had really established. It takes some determined discipline to keep the controls in a pro-spin condition.
This was in a PA-28. Getting a common garden variety Cessna 152 to spin must be well nigh impossible.