I once had this challenge coin which I kept inside my pocket and brought with me everywhere I went. The purpose of that was: whenever I would feel defeated and down, I would reach inside my pocket and I would feel the coin. That would make me remember the things I’m grateful for in my life. Just thinking about these things, it’s enough to challenge me to do good and become better. Try getting one of your own. It’s a simple, yet effective way to challenge oneself.