Our words have such an effect on each other. Just saying one nice thing to someone can completely alter their views on the day and world, and could even save a life. Try saying something nice anytime it comes into your mind. Make kindness a habitual lifestyle, not a chore!
The thing I love about this is that it doesn't even need to apply to the physical. Yes, my thing could be completing a marathon or climbing a mountain, but it could also be changing my major or moving across the world. I could make them all gasp, one day.
"If your actions inspire others to dream more, learn more, do more and become more, you are a leader" -John Quincy Adams, 6th President of the United States and my Super Great Great Grandpa somewhere back there.