Have you written article queries? It has been my experience that many publications have a “closed to new writers policy” and others will allow you to write them a query. How about checking the websites for query instuctions?
More on queries – http://ezinearticles.com/?10-Steps-to-a-Magazine-Query&id=34491
I am not sure what you mean by featured, but I would guess that there exists hundreds of thousands of fitness professionals with an interest in being recognized. Often times writers are not practioners in their field but excelent writers and detectives. Consider – what makes you unique? What do you possess that can change someone’s life? What specific skills do you come to naturally?
Look at your sphere of influence. Do you know someone who knows someone in a position to help you along?
Start with a small local publication and do it for free and see how it is accepted.
All the best