Tarq 57, your comments are fine for an experienced pilot but try it with a student often enough and you will see a botched recovery. Not a good spin trainer for sure, but plenty strong enough. Who ever heard of a 172 breaking up in flight? It would be a rare occurrence indeed.
27/09 if you can't get a 172 to spin easily you are using the wrong technique. Try with a bit of power next time. No aileron needed.
BTW I don't recommend spin training in them at all because a botched recovery will see VNE arrive quite quickly, especially if the power is left on. As others have said, there are far better aircraft for the job.