Ok, so basically, I need to floss more and drive less recklessly (when I drive at all, which is rarely). But other than that, I'm doing good at targeting longevity.

steeples fingers

Eeeeexcellent. Everyone who claims to aim for immortality or personal happiness but doesn't exercise, turn in your rationality card right now.

I can't claim any super-insightful techniques for actually building good habits and making good decisions, personally. My main technique is just to make a decision by putting myself in the shoes of future-me and asking what he's going to care about more.