In terms of human health i think fitness instructor/exercise therapist are the best preventor..the only thing doctor can do for human is to advice and prescribe drugs in terms of human health so that they will feel healthy and too much of this drugs can lead to another thing. the only help the doctor can do is to give drugs when human being has enter critical condition or coma and save life.......** The fitness instructor/exercise therapist will not only advice you but will give you drug which is exercise to keep you fit..when you are into exercise everyday you won't feel ill but keep fit and prevent all sort of diseases...things fitness intructors can do which doctors can't do in terms of health, prevention and healthy lifestyle...they help in borning fat/cholesterol,they help in flexibility, during exercise especially aerobic activities the heart pump more oxygenated blood to the brain and help in the prevention of heart diseases emotional stability, and fitness of the whole body without pain or fatigue...pls arguement with reasonable point...