GO OUTSIDE: As people spend less time outdoors, Pasricha says many are experiencing what has been called "nature deficit disorder." Some studies have found even just walking around in a forested area can help decrease cortisol levels in the body, he says.

READ MORE: Other research has found that reading plenty of fiction can help people develop better empathy, compassion and understanding by opening up the brain's mirror neurons, which are activated when someone does an action or sees someone else do the same thing.

ROSE THORN BUD: Called "rose, thorn, bud," the game involves people sharing three things: a highlight or something that went well, something that didn't go well that needs to get off their chest, and finally something they're looking forward to. Happiness doesn't necessarily mean having many big moments in life, Pasricha says. Most of the time, it's the little things in life that bring us the greatest joy.

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