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Simple puzzles like crosswords can help your brain do some basic work. These are easy to fit into your day. You can even find some for free online. Large, complex puzzles give your brain a stronger workout. These can sometimes take several days to a week to finish but they're worth the effort. This doesn't just mean a puzzle in the traditional sense either. Check out Japanese pocket puzzles for a serious brain teaser that you can do while you're killing time. Chess is an incredibly strategic and tactical game. Few puzzles surpass chess in working out your brain. Chess is simple to  learn and easy to play. Look into joining a chess club in your area to get more opportunities to play and learn from more experienced players. Did you know that playing video games in moderation may actually make you smarter? Puzzle solving games like Mario, Zelda, Scribblenauts, and Myst are like a good cardio workout for your brain, helping you to become a better, more creative problem solver, and a faster thinker.
Do daily crosswords and puzzles. Progress to more involved puzzles. Consider playing chess. Play video games in moderation.