Teach Mindfulness, Invite Happiness
Mindfulness is a way of paying attention to present-moment experience and doing so with kindness and curiosity. It is not cognitive but sensory, and so taps into and strengthens different but vitally important parts of the brain that have been neglected by traditional education. One crucial attribute of mindfulness is that it is practiced without judgment. Many of our students are so hard on themselves and their internal critic is so loud that just a few moments of being given permission to not judge can bring huge relief to body and mind. I have seen it bring students to tears.
There is now ample evidence that mindfulness practice enhances positive emotions (PDF).
4 Ways to Refuel Your Gratitude
Applying Mindfulness to Mundane Classroom Tasks