People throw around the word "purpose" like it's obvious. You're basically saying that taking charge of your health is a distraction. I would say that taking charge of your health and leading by example among your friends, family, and coworkers is a worthwhile pursuit. Is it the ultimate pursuit? Maybe. Maybe not. Mastering ones body/mind state through rigorous training and consistent application of that training does put one in a clear enough mental state to think through the more "meta"/philosophical aspects of life, that can lead to discovering ones "purpose".