Entropy is defined as a process of degradation or running down or a trend to disorder.
A humans life is the perfect example of entropy. We are born with 100% of our potential available to be actualized; all that we can do and everything we can achieve exists only during the first few years of life. Our bodies and brains are primed to be shaped by the environment, to learn how to exist within it in a symbiotic, fulfilling and life-sustaining way. This period of time is not impacted by our intellect as we do not have a high level of consciousness.
Our perfectly developed bodies move naturally, through a full range of motion, uninhibited by overuse, dysfunction or injury.
We are in a state of maximum order and this state can be maintained easily with deliberate action of thought and movement. Entropy, while unavoidable, can be postponed if the individual does the things that sustain order.
Very few people do these things. Most tend to float through life passively, doing what is easy, what feels good and what takes them off course, guided by impulse and repulsion into an unplanned future. Their body and brain become broken-down systems advancing ever faster to the final state of chaos (death).
The essential role of fitness professionals is to help the individual delay entropy. At the root of their practice is the wisdom that people are born perfect and learn to behave in ways that expedite the consequences of increasing disorder. They know, or should know, that they facilitate the clients realignment but that they are not a critical or unique catalyst; their intervention is to shape the actions of the client but the client is in control of everything.
It has been my experience that most of the people who are involved in the fitness industry do not understand or accept their role. It is humbling maybe for an expert to see themselves as a servant to those who do not possess their knowledge but humility is a key characteristic for anyone who is attempting to alter the course of someones life without creating a relationship of dependency.
And these may be the biggest problems with the fitness industry; the egos of those experts and their perceived need to create long term clients.