As people, we have different dimensions that affect one another. The Physical, Mental, Spiritual, Social, Emotional, Environmental, and even Occupational. Working on our fitness is one way to improve our physical dimension affecting all the rest. To that end, I think the minimum goal that anyone should have when it comes to fitness is being able to move effectively. It takes hard work and sweat but, you are the only one that you have to deal with your whole life, so being able to literally pull your own weight can be a first step to a better life.