Gymnastics is one of those sports that looks so impossible that it's not even worth a shot, however, I competed and participated in the amazing sport for 11 years and it was one of the best things I've ever done. The self-discipline that comes from it really keeps you in line, and you learn to manage your time better, especially if you participate in competitive gymnastics.
Gymnastics is also one of those sports that is so easy to brag about. Once you learn how to do a back flip, or the splits, or even a handstand, people think you are the most talented person in the world. It's not necessarily a good thing to be a show-off, but gymnastics really makes you want to show people what you can do, and have fun while doing it!