Everybody loves a challenge, especially runners. So, I’ve got a doozy for you. I challenge you to do 13 half marathons in 2013. That’s more than one a month, which means it’s not appropriate or reasonable for new or inexperienced runners, but for experienced half marathon and marathon runners, this will be great fun. I explain how to enter and complete the 13 x 13 in 13 Half Marathon Challenge.