- You have to smile 30 seconds a day.
- At the end of the challenge it will be saved as an achievement.
- So you can control which days you have smiled and which not.
- Smiling and laughing is very good for your health, it rejuvenates you.
- When we smile we use between 12 and 17 muscles.
- Smiling also sends more oxygen to the brain.
It also releases endorphins which are the hormones of happiness.
- The smile diary.
