On The Lighthouse Mauricio Estrella shares his life changing tip: change your computer password. He compares his passwords to mantras, encouraging you each time you sign into your computer or device. 

I've been using a similar strategy for a few years now and enjoy having a reminder of a positive memory or an affirmation for myself several times throughout the day. 

Try out a phrase or word, such as Iamstrong or GoOutsideToday. Check out the article for more examples.