Are we making a distinction between a 'trainer' and a coach? It sounds like you have coach, Globe. Someone who is teaching you a set of skills and helping you progress toward well-defined goals.
When I hear someone described as trainer, I just assume the worst. In all my years of going to commercial gyms, Ive never seen one that's worth a damn. Not a single time. These people put their clients through workouts ranging from silly to downright dangerous (think 60-year-old women balancing on some kind of ball, head within striking range of a sharp metal rack.) The common thread is that clients never make progress, nor do the trainers even attempt to quantify what progress is.
A hard workout != having an effective trainer.
This is the quote of the thread. Any fool can make you gas. Designing a program that allows a trainee to progress past the beginner-phase, though, requires a little knowledge of structuring some progressive overload and adaptation.
What Im left wondering is what these certifications can possibly be teaching in their seminars? It's hard to believe this ineffective shit has managed to persist and thrive...