Apparently, the problem with barefoot marathoners isn't that they'll hurt their feet. It's that all marathoners -- regardless of footwear -- increase their risk of heart attack:
Medical directors at the Twin Cities, Boston and New York marathons said they have not seen any injuries more serious than a blister among the small number of runners who go barefoot, noting that they have more serious issues to worry about, like cardiac arrest.(Mark Sisson recently wrote about this topic here.)
What? You need another reason not to run a marathon? Here one more: BLOODY NIPPLES.
(Source: New York Times & Buzzfeed / Photo: Martineric)