3. Exercise

We all know that exercise contributes to overall health, but researchers have found it can also make you happier. In one study, older adults who started exercising regularly reported that, after eight weeks, they felt significantly happier.

Another study found that when inactive people increased their physical activity, their happiness improved too. While more study is needed to identify what type of exercise works best, you can start by walking, running, swimming or whatever helps improve your mood.