Part of the work my clients and I do together is to define what is health for them.  While the answer is a little different for each person, a large part of it usually has to do with growth of some kind or another. If you imagine a tree, growth is a good marker of health.  It is the same with people. So, it is important to know what elements are needed for optimal growth. And, often what this boils down to is a balance of structure and flexibility.