Pick one area that needs a nudge: Choose one area that keeps slipping (sleep, screens, meals, movement).
Write one small rule you can keep most days: Make it specific and modest so it feels doable. Add one exception if needed. (e.g., “OK on travel days”).
Place the cue: Put it where the action happens (phone lock screen, fridge, desk) and review once a week.
Write your policy on a sticky note and place it where you’ll see it today.
Keep policies about what you control, not others. If a policy fails often, shrink it until it’s keepable; change is easier when wins are frequent.