You’ve heard that imagining an audience in its underwear melts anxiety about public speaking, right? If that’s true, then running, jogging or walking the Undy 5000 should make you way less nervous about exercising in public, since everyone will be in their briefs. The timed 5K race begins near the Country Music Hall of Fame, heads down Demonbreun and circles Music Row; A one-mile fun run will also take place on the first third of the course. Underpants are optional; if you prefer more modest attire, you’re still welcome to participate, and the event is appropriate for all ages. Why run, you might ask, if nothing is chasing you? Proceeds benefit the Colon Cancer Alliance, a nonprofit advocacy group that funds awareness, screening and research efforts to prevent colorectal cancer, as well as a variety of support resources for patients undergoing treatment and cancer-free survivors. It may seem crude to draw attention to one’s bum, but 90 percent of cases of CRC are preventable with proper screening. The only question left: What did we do with our Superman skivvies?