The Big Shoulders 5K Swim: a Lake Michigan-size test of guts, determination and fortitude amidst the chilly, windswept waves. Like all the best races in the world, Big Shoulders started with an inspired individual who had an inspired idea. Founded in 1991 by the late Bill Mulliken, Olympic Gold Medal winner ('60 Rome breaststroke), Big Shoulders has grown to be one of the premier open-water races in the United States.