For those who can't quite justify a hobby due to time constraints, pick something that will broaden your horizons while also beefing up the skill section on your résumé. Coding is one example. And it doesn't necessarily have to be learned in a classroom setting. There are online programs that teach the fundamentals using "Star Wars" or "Minecraft" games, such as Code.org. And if you get stuck, you can probably ask your kids for help.