Back in the 1970s and 1980s marathons were the big thing. Then 100 milers sprung up until there were 115+ in the United States alone. Suddenly 200 milers have exploded onto the scene, with the Grand Slam of 200s having its inaugural year in 2015. I'm going to run all of them that I possibly can in 2015, attempting to set the world record for most 200+ mile races in a year.