What is the most important aspect of achieving optimum fitness?

I agree with LaRue here. My training style focuses initially on providing my clients with positive fitness experiences. My clients may not get sore after some of their sessions, but they are almost guaranteed to have fun! The first step toward building that pyramid of fitness is to get a solid grasp on the fact that getting fit and staying fit does NOT have to be monotonous or even labor-intensive. With the right frame of mind, “hard labor” in or out of the gym is no longer seen as a negative experience, but a positive step towards greater rewards in physical fitness and overall health.

Getting a client to understand that there WILL be a sense of accomplishment by the end of every session, I think, is the first step to assisting a client in achieving optimal fitness.