The Beast of Burden 100 & 50 Mile Ultra Marathon series is not a race at all. Sure, there's a timing clock, a start/finish line, and some truly awe-inspiring world-class runners who will travel from the far corners of the globe to toe that line and race that clock on one of the flattest, fastest and most runner-friendly surfaces on the earth in hopes of setting new world records. But, that's just a centerpiece for what really makes the B.o.B. special. This event is our semi-annual family reunion for ultra runners as unique as yourself.