I've already started doing a few of those things on a haphazard basis, but you've definitely filled in some gaps.
I made a 30-day exercise plan, ever-so-gradually increasing each exercise, simply to see if I was physically capable of accomplishing the 30-day exercises by day 30 - and after having made the plan, have been doing the workouts. I've added and subtracted some foods, but I haven't written down a pre-planned meal schedule yet... it's not an approach I'd have thought of anytime soon, and it's one I'm going to have to seriously consider.
I'm still on my first short-term plan, and when I made it, I honestly didn't know whether I'd be able to complete it. If no other plans occur to me, I could simply extend my initially-planned 30-day ramp-up into a 60-day one, then a 90-day one, if I still can.
"Cryonics has a 95% chance of failure, by my estimation; it would be downright /embarrassing/ to die on the day before real immortality is discovered. Thus, I want to improve my general health and longevity."
That thought has gotten me through three weeks of gradually increasing exercise and diet improvement (I'm eating an apple right now) - but my enthusiasm is starting to flag. So I'm looking for new thoughts that will help me keep going, and keep improving. A few possibilities that I've thought of:
Pride: "If I'm so smart, then I should be able to do /better/ than those other people who don't even know about Bayesian updates, let alone the existence of akrasia..."
Sloth: "If I stop now, it's going to be /so much/ harder and more painful to start up again, instead of just keeping on keeping on..."
Desire: "I already like hiking and camping - if I keep this up, I'll be able to carry enough weight to finally take that long trip I've occasionally considered..."
Curiosity: "I'm as geeky a nerd as you can find. I wonder how far I can hack my own body?"
Pride again: "I already keep a hiker's first-aid kit in my pocket, and make other preparations for events that happen rarely. How stupid do I have to be not to put at least that much effort into making my everyday life easier?"
Does anyone have any experience in such self-motivation? Does this set of mental tricks seem like a sufficiently viable approach? Are there any other approaches that seem worth a shot?