If you want to become physically stronger, you'll need healthy habits - like going to the gym. You'll also have to give up unhealthy habits - like eating junk food. Building mental strength requires healthy habits - like practicing gratitude - while also giving up unhealthy behavior, like giving up after the first failure.
I see Americans of every party, every background, every faith who believe that we are stronger together: black, white, Latino, Asian, Native American; young, old; gay, straight; men, women, folks with disabilities, all pledging allegiance under the same proud flag to this big, bold country that we love. That's what I see. That's the America I know!