The Geist Half Marathon is an Indiana not-for-profit corporation (501c3) organized to inspire health and wellness in the children living around Geist Reservoir in Fishers, Indiana. To date, over $400,000 has been raised and given back to Geist area schools. The 13.1-mile half marathon, 10K and 3.1-mile 5K routes are certified and sanctioned through USA Track and Field. Over 5,000 individuals participated in the event in 2017.