I think you're going to find that dealing with people at your MMA gym, who are generally young and athletic, is a lot different from personal training in the outside world.
Your typical clients in a commercial gym are 48 year old women who are overweight, have a bad hip, and who don't really like sweat. She'll frequently miss workouts, and you won't be able to actually program her training because her training is so inconsistent. What do you do? You come up with a dozen light exercises that involve flailing some limbs around, and then baby-sit your client as she works through them. You don't make the workouts hard, because if the workouts are hard, your client might quit. This process repeats itself until you've got a coven of middle aged women clients, and the transformation is complete - you've now become one of the useless trainers that we see at every gym.