"The History of Fitness" by Lance C. Dalleck, M.S. and Len Kravitz, Ph.D.
By now I hope that I have stimulated a few thought provoking questions. For me there are a few main questions I want you to consider.: 1) Why do I perform the type of exercises that I do regularly? and what do I expect to gain from them? 2) Why does fitness have so many different definitions and forms? 3) Why does this defination have such a different meaning in other cultures?
The above link provides an excellent frame of reference for these questions.
My challenge to you is to re-write your definition of fitness.