I’ve always been ashamed to admit that I try harder in class when I know the teacher is looking at me. I also elevate my arabesque higher when I'm standing next to the girl with great extension. While I realize competition is part of our human nature, I wish I could push myself on my own. Now, there's a new (free!) app, Proof!, that helps you accomplish your goals by adding a little friendly virtual competition. Through the app, you set up personalized goals and share them with friends or family.