1. CR_SSW__D_S1.Medically proven brain-buliding technique that's lots of fun, too! To build up your abdominals, try situps; to pump up those biceps, you can try lifting weights; but to exercise those mental muscles, crossword puzzles are the way to go! So if you're looking for a great workout that will leave your brain refreshed and recharged, there's no better way to do so than by grabbing a New York Times crossword puzzle and solving away. Features:* 75 great New York Times crosswords from puzzle master Will Shortz* Puzzles arranged in order of increasing difficulty, so your brain can get the workout you desire.Studies suggest that adopting intellectually challenging hobbies like crossword puzzles. . . can boost your brainpower.- Natural Health magazine | The New York Times Crosswords to Exercise Your Brain, Paperback | Indigo Chapters