It's no surprise why our brain's pleasure centers light up when we hear music. (The same brain structures that are active during euphoria-inducing stimuli like sex and drugs are clicked on with a good Glee mashup, too!) So, plug those headphones in and work along to your favorite jam.
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It's fun, it's harmless (or, at least, it should be), and it's effective. Nothing gets the heart pumping and the brain working like a little flirtin' action, just don't do anything stupid. Keep it to conversation — thinking on your feet, cracking jokes, and intellectual banter will energize you plenty.