Clearly the answers above reflect a reality that Personal Training is a door through which to walk. Where you walk to, once you open that door us up to each and every individual.
I myself never intended to become a Personal Trainer. I entered the field after obtaining my first (or many) certifications to gain experience and give credence to my knowledge of “fitness”.
I did this as a means to promote both non-chemical therapy to overcome depression, which was part of a larger plan to promote a program of wellness facilitated by products I intended to import from foreign nations.
Instead, I learned along the journey of other modalities, and equipment as well. In addition I found something I truly enjoy, but way to fragmented for me personally to depend upon for my income solely.
Personal Training though has given me a very enjoyable means of creating a supplemental income, that allows me to work with and assist people in ways that brings me a great amount of joy. It has also not only taught me the importance of exercise, but shown me benefits specifically.
I would never retire; how does one retire from her life? So much of what I do professionally is an extension of what I do personally. I would, hopefully, keep evolving. Personal training is simply one facet of the health, fitness, and wellness industry. I aspire to life-long participation in this incredible field!