Here is the link to AJ Jacobs' TEDTalk (if you haven't found it yet).
And to his book, Thanks a Thousand.
Day 11 — Fake it ‘till you feel it
Music: Christine and the Queens Tilted
Day 9 — Smell the Roses
Beginning in October 2022, I embarked on a 46 day gratitude practice (from Canadian Thanksgiving through to American Thanksgiving), hosting a live session each day where we did 3 things: movement, learned something or were inspired by someone, and then had a short gratitude practice, often journalling with the prompt coming from what we had learned that day.