How do I teach my kid about mindfulness and mental wellness?

Hey there! I just watched the saddest documentary about children and suicide/violence. The main closing point was that children should be taught mindfulness and mental wellness strategies from a young age.

I have no idea where to start with my son. When I think of those terms, I picture meditation, breathing techniques, and discussing emotions. I googled “How to teach kids mindfulness” and didn’t get much.

Is there anything I can do regularly to help my 9 year old with his “mental fitness?” What are some easy and fun ways to infuse your family’s life naturally with mindfulness? I know that mindfulness should be cultivated over a lifetime, but how do I give my child a headstart? Any suggestions?