Yesterday, Justin Daerr and Danielle Kehoe were the top men's and women's finishers
at Ironman Boulder. But before the main event got underway, plenty of competitors reminded us that we've been slacking on sit-ups via the Ironman Boulder Underpants Run, which sported more six packs than your neighborhood King Soopers. Our Brandon Marshall was on hand to capture pics of all that taut flesh. Check out a sampling of his photos below and click to see the complete "Boulder Ironman Underpants Run
" slide show.
See also: Videos: Ultrarunner Adam Campbell on Being Struck by Lightning in Race and Finishing Third