Pros
Its a fairly active job where you get to move around. You get to develop relationships with your clients. Take your time and develop great relationships with your clients, it makes it harder for them to leave you. Once you have your clients to a certain level try to put them into group classes where you continue to teach them. Your fellow personal trainers tend to be pretty cool.
Cons
If you actually teach people what you are doing and why you are doing things in what order, you risk losing them as clients because they can become independent and feel that they may not need your services as a personal trainer. My boss told me I was revealing too much to my clients and that I should hold back some. I had a lot of success with my clients and they got great results in a short time. That means they may not need you soon and you'll need to look for new clients. If you talk bad about a lifetime supplement and you probably will get found out because your manager calls your clients for feedback to see how you are doing, you can get written up for talking bad about Lifetime supplements or recommending supplements from other places because some of the lifetime supplements can be pricey. If you work at a slow club, you may find it hard to make enough money to stay as a personal trainer. Pick a busy club in a wealthy area. Look at the cars outside the club and find put when the club has it's busy times. I think someone should form a union of personal trainers at Lifetime and demand a 10% boost over their current pay scale. Take that up from starting at 49% to starting at 60% commission and take the top up from 58% to 70% total commission. Seriously management would keep more personal trainers and that would stress out management less. Some of Lifetime supplements are great. Some of them are over priced. They may claim higher quality and purity of product, but it's like tripling the price of whey protein to get maybe a 5-10% better product.