The 3 Good Things Exercise
The “3 good things” exercise is one of the most well-researched and accessible gratitude practices in positive psychology. It takes less than five minutes, requires no special equipment, and has been shown to produce lasting improvements in happiness and reductions in depressive symptoms.
How it works
Each evening before bed, write down three things that went well during the day. They don't need to be extraordinary — a good cup of coffee, a kind word from a friend, or finishing a task you'd been putting off all count. For each one, briefly note why it happened.
That second step — the “why” — is what separates this exercise from a simple list. It trains you to notice the causes of good things in your life, whether that's your own effort, the kindness of others, or just good fortune. Over time, this shifts how you interpret everyday experiences.
The research behind it
This exercise was developed by Martin Seligman, often considered the founder of positive psychology, along with colleagues Tracy Steen and Christopher Peterson. In their original study, participants who completed the 3 good things exercise every night for one week reported being significantly happier and less depressed compared to a control group.
The most remarkable finding was durability. Follow-up assessments showed the benefits persisted for six months after the initial one-week period — even for participants who didn't continue the exercise daily. Those who did keep going saw even greater improvements.
Why it works
Our brains have a natural negativity bias — we tend to dwell on problems and overlook what went right. The 3 good things exercise directly counteracts this by creating a deliberate habit of scanning for positives.
With consistent practice, you start noticing good moments as they happen, not just in retrospect. Many people describe it as a quiet shift in awareness — not forced optimism, but a more balanced view of their day.
Tips for getting started
- Be specific. “Had a good lunch with Sam” is better than “had a nice day.”
- Include small things. Not every entry needs to be a milestone. Ordinary moments matter.
- Do it at the same time. Right before bed works well — it gives your mind something positive to settle on.
- Don't judge your entries. There are no wrong answers. If it felt good, it counts.
- Stick with it for at least a week. The research shows meaningful benefits in as little as seven days.
Try it with Delightful
Delightful is a completely free gratitude journal app built around the 3 good things exercise. Choose from 150 curated prompts when you need a nudge, attach photos to capture special moments, track your streak to build consistency, and sync everything across your Apple devices with iCloud. With gratitude cards, a rich calendar, word clouds, and 33 languages — it's everything you need for a meaningful practice, with nothing you don't. Available on iOS and Android.