Three Good Things Exercise: A Nightly Practice Shown to Lift Mood over Time
Each night, write down three things that went well and why, a small, well-tested practice shown to lift mood and lower low feeling over time.
About this tool
Three Good Things, sometimes called the Three Blessings exercise, is one of the most studied practices in positive psychology. The instruction is simple: at the end of each day, write down three things that went well, then add a brief note about why each one happened. That second step matters. Pausing on the why turns a passing good moment into something you actively notice and credit, whether to your own effort, another person, or good fortune.
In the original study by Martin Seligman and colleagues, people who did this for one week were measurably happier and less depressed than a control group, and the benefit grew over the following months for those who kept it up. The likely reason is attentional. Our minds have a built-in negativity bias that scans for threats and problems. Deliberately recording what went well, night after night, gently retrains attention toward the good that is already there.
The good things do not have to be big. A warm cup of coffee, a kind text, a task finished, a moment of sun all count. In fact, noticing small goods is part of the point, because most days are made of small things. Keep it short and consistent rather than long and occasional.
In Seligman's original trial, the happiness gains and drop in depressive symptoms were still measurable at the six-month follow-up for people who kept the practice going, which is longer than most single-week interventions manage (Seligman, Steen, Park, Peterson, 2005). The most common way people undercut the exercise is skipping the why: three quick nouns scribbled from memory do less than one sentence that names the small cause behind each good thing, since the reflection is what does most of the attentional work.
If low mood is persistent, comes with trouble sleeping or eating, or does not budge after a few weeks of consistent practice, that is a sign this exercise alone is not enough, and it is a good time to talk with a licensed therapist. Psychology.com's therapist directory is a free way to find one.
References
- Seligman MEP, Steen TA, Park N, Peterson C. Positive psychology progress: empirical validation of interventions. Am Psychol. 2005;60(5):410-421.
- Emmons RA, McCullough ME. Counting blessings versus burdens: an experimental investigation of gratitude and subjective well-being in daily life. J Pers Soc Psychol. 2003;84(2):377-389.
Cite this source
Psychology.com. (2026, September 14). Three Good Things Exercise. Psychology.com. https://psychology.com/tools/three-good-things
Three Good Things Exercise FAQ
What is the Three Good Things exercise?
It is a positive psychology practice where each night you write down three things that went well that day and why each happened. Research found it can raise happiness and reduce depressive symptoms, with benefits that last when the habit continues.
Why do I have to write why each thing happened?
Reflecting on the cause turns a fleeting good moment into something you actively notice and savor. It also helps you see the sources of good in your life, including your own actions and the people around you.
Do the good things have to be big?
No. Small moments count and are encouraged, since most days are built from small things. A good meal, a kind word, or a finished task are all valid entries.
Is my data saved anywhere?
No. The tracker runs in your browser and nothing is uploaded. The PDF is created on your own device.
How long should I do the Three Good Things exercise?
The original study asked people to do it for one week, and those who kept it going afterward were still happier and less depressed at a six-month follow-up. Two weeks is enough to notice the practice shifting your attention, and there is no harm in continuing indefinitely.
Does the Three Good Things exercise help with depression?
In the original trial, participants who tried it showed fewer depressive symptoms compared to a control group, with benefits that held up months later for those who continued. It is a helpful self-help practice, not a replacement for therapy if depression is persistent or severe.