What are the disadvantages for an animal trainer?

Some pros to becoming an athletic trainer are that depending on the level of player in which you teach and how well you teach you can make a ton of $$$. An example of this is the trainers of Tim Tebow. They taught him how to fix his throwing motion and in return they gained a lot of publicity as well as a boat load of cash from his first advertisement. So all in all if you work hard and make a name for yourself it can be a very rewarding business.