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An athletic trainer, physical therapist, and sports medicine.
a physical therapist must have a doctorate now
If you mean, is it easier to perform the jobs of a physical therapist or a sports doctor, then the physical therapist will probably exert more muscles in the course of a day's work than a doctor would. Both have to carry liability insurance and the mental anguish associated with the need to have that insurance. It is easier and quicker to go to school to become a physical therapist than it is to become a licensed physician specializing in sports medicine. It is harder physically to be a physical therapist, but it is harder intellectually and educationally to be a physician- because you will have to go one of the MD (medical doctor), DC (chiropractor)or ND (naturopathic doctor)routes.
To become a physical therapist assistant, you are required to have an associate degree in physical therapist assisting. Licencing requirements vary from state to state.
You cannot become a therapist when you are addicted with Marijuana. A good therapist must not be a patient of any kind of addiction.
A tutorial on how to become a physical therapist can be found from sites offering career advice, including Careers Advice. Becoming a physical therapist requires at least a two-year associate's degree.
you can get fired and not be able to become a physical therapist again or have to restart again with your degree.
No way!
You must be licensed before you can work as a physical therapist (except as an intern). In order to become licensed you must pass a comprehensive examination. That would imply that you are a physical therapist -- or at least trained as one.
There are indeed specialty schools for becoming a physical therapist. There is a lot of school that is involved with this line of work.
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First you need to become a physical therapist. Then you must somehow get contacts to the specific group you are targeting, in this case, "famous athletes". If you manage to get them interested in your services, they might become your customers.