The true process of becoming a trainer at LTF is 3-way process. First you must get an interview which, if you have a clean record with a background in fitness, is not all that difficult. You meet with each of the 3 or 4 department heads and discuss your experience, background, etc (it's a piece of cake if you have any sense or present yourself reasonably well).
The next step is going through the week-long certification process wherever it's being held (I must admit that it's sort of nice, they give you a $500 stipend for food and pay for your hotel and gas expenses for the week). You sit with new hires from around the region and learn the products, go through the sales process, learn the commission structure, take group classes together, etc.
The final step in the process is the only difficult part and that is applying this to the gym where you work: Setting up tasting booths, prospecting new leads off the gym, setting up your schedule and book of business. Even though most people wouldn't consider this a formal part of hiring, there is definitely a sink-or-swim period when first hired and a very high turnover rate among new trainers who think they're going to be given a great book of business out of the gate. If you fight like a gazelle, you have a chance to make some real money but there are extremely long hours involved (many of which you're not actually working but sitting in an empty gym throughout your 7 hour shift) and you have to do alot of the work on your own. If I had to guess, I would say 1 or 10 trainers at LTF lasts more than 3 years or steps into a management role. Everyone else comes to their senses and realizes what a waste of time it is to expect things from higher up's who are mainly out for themselves.