What's Your Definition of Greatness?

Dr. Ayman: I do it pretty much when I feel stressed, if I was maybe a little more disciplined, I'd do it every day. But you know, it's just such a cool tool to use. The final question, I ask all my guests at the end, what is your definition of greatness? You know, I don't know that I have one on greatness, but I do have one on happiness. That in reality in my experience and for my life, it is the presence of purpose. And I think when people live purpose driven lives that they live longer, they're healthier and can withstand the stresses that come their way.