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Gym rats, science is about to make you look stupid. According to Richard Restak’s latest book, The Naked Brain: How the Emerging Neurosociety Is Changing How We Live, Work, and Love, you can skip that spinning class and get the benefits of cardio by…thinking about it. According to the George Washington University professor of neurology, “If you’ve learned a physical exercise and then later mentally rehearse it, you will induce an increase in muscle strength comparable to what would happen if you actually did the exercise. What’s more, your heart rate and breathing frequency will increase.” Restak’s theory is rooted in neurosociety, which uses functional brain imaging to determine the relationship between noggin activity and all aspects of daily life—including how fevered attraction can be bottled into a literal, shot-in-the-arm chemistry that can make you lust after the office dork. No better time, then, to trade sex-on-the-brain for a 24/7 obsession with your abs. Restak discusses and signs copies of his work at 6 p.m. at Politics and Prose, 5015 Connecticut Ave. NW. Free. (202) 364-1919. (Tricia Olszewski)