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.
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.