I recently interviewed Andy Dunn of Bonobos for one of my New York Times columns and I loved hearing all the ways he's trying to improve himself for both life and work. One tip that I held onto from our chat: to make sure to earmark time to spend alone and without the guilt that you should be doing something else. In Andy's words: "One of the best pieces of leadership advice I got and am challenged to follow: Great leaders spend a lot of time alone. When you’re alone is when you can think, reflect, write, read, dream. That enables you to show up better when you do have to show up to group settings."