I firmly believe that you'll never know what you really want to do, if you don't already, till you try it. (Considering I didn't know what I wanted to be till I was ~28, and still have lots of things I'm interested in.) The key is to pick your passion and work on it. Side quests can enrich your life, or they can leave you perpetually going nowhere fast, depending on how you keep your focus and how well you can tell what you want.
IMO, the thing that makes or breaks a trainer is marketing above all else. That's how you get those insanely idiotic gurus out there making gabillions who are complete and total nincompoops that believe and preach all sorts of ridiculous things. (Or good trainers not doing so well.) So as long as you're halfway decent and able to promote yourself, you'll prolly do fine.
Med school to be a trainer seems like serious overkill, and not really in the vein of what would seem necessary. Phys ed degree, exercise science, or things of that nature seems better suited.
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