Eight happiness interventions with documented short-term effects.

1. Walk for 10 minutes outside
2. Call one specific friend
3. Do 20 push-ups or bodyweight movement
4. Write three specific gratitudes
5. Do one small act of kindness
6. Listen to music you love
7. Breathe 4 seconds in, 6-8 out, for 2 minutes
8. Change your environment — go to a café, open a window, tidy a desk

Stack three; mood lifts measurably within an hour.