Habit Streatk, (or I think Habits for iOS).
Do something once a day, everyday. E.g. small chore, commit code, read book for a few mins... etc.
This, coupled with "Matt Cutts: Try something new for 30 days | Video on TED.com" had a huge impact on my life over the past 7-8 months and built my self-disciple (though still room for more disciple :) ).