I agree with Gary. Fitness / health is a terrific business to be in. In addition to personal training (which is a great foundation) I have colleagues who are Health Coaches. They have training in nutrition, stress management, and lifestyle health. I also have colleagues who coaches who specialize in coaching runners. They build training plans to help runner meet new goals. There are also very cool non-profit running based businesses - Girls on the Run is excellent! There is an LA council: http://gotrla.org/. Maybe check them out?!
I love running, too. I coach an after school running program for 3-5th graders. It is an incredible way for kids to build their self esteem. I have seen kids who thought they had no athletic skills run a whole mile - they are so proud!!!
Run on, Karla!