McKirdy Micro: Breaking 4:00

McKirdy Micro: Breaking 4 is a marathon-style event held at Millennium Park in Walker, Michigan, just southwest of Grand Rapids. The course is designed for breakthroughs: six 4.05-mile loops plus an approximately 1-mile tail at the start and finish, with about 70 feet of elevation per loop. A tangent line helps runners cover exactly 26.2 miles.

The event emphasizes in-race support, including dedicated pacers, nutritional guidelines, and pre-race meetings, plus personal bottles at aid stations for precise fueling. Runners enjoy a spectator-friendly layout—friends and family see you every ~4 miles. A $10,000 prize purse rewards sub-4 finishers. Visit the organization's website for the most recent information.