For instance, I want to be able to live a lifestyle, for the rest of my life, where I maintain my health. On any given day or month, it may mean exercising one way or altering my food, or seeing a professional. All of these are actions and they certainly are all part of the "Being Healthy" project. And yet projects are defined as "finish lines", whereas this one won't ever be finished.
Is there something else in GTD that handles this that maybe I didn't notice? If I just use a project for this, how will having a never-ending project affect the way GTD works?