Looking for a true test of grit and perseverance? Then the I-35 Challenge is for you! The I-35 Challenge offers runners a chance to run in the Garmin Kansas City Marathon on Saturday, and the IMT Des Moines Marathon on Sunday. Two states, two days, one interstate connecting them. Runners can choose any combination of either races’ full or half marathons to complete the challenge. Registering for this event comes with an added medal and t-shirt to commemorate the accomplishment!