It just might be the toughest 5k on the planet. Every year on the 4th of July a group of dedicated runners, crazies, and a combination thereof gather in Seward, Alaska for the annual Mountain Marathon. The Mountain Marathon is as rugged as the mountains of Alaska themselves, combining steep uphills, treacherous downhills, and every type of obstacle you can imagine. Check it out and see for yourself what makes this annual tradition so special.