The IRONBULL™ has existed as long as humans have been on Earth. Its spirit resides within each of us: where the driving urge to test one’s physical adversity, push our bodies to the limit, and challenge our inner selves mentally and physically all align. IRONBULL™ is a 501c3 non-profit corporation that hosts extreme endurance, running, paddling, biking, adventure, cross-country skiing and snowshoeing races for the Toughest of the Tough! Located in Central Wisconsin, the Extreme Sports Capital! Are you IRONBULL tough?