Sara Heesen, a professional athlete with Alpha Warrior and two-time finalist on American Ninja Warrior, demonstrates an obstacle on the Alpha Warrior Battle Rig before a competition at the YARS Fitness Center, Nov. 4, 2018. Heesen teaches obstacle techniques and movements to both children and adults in Minneapolis, MN. The Alpha Warrior program brings the obstacle-based fitness apparatuses to Air Force bases to host friendly competitions and inspire Airmen fitness. (U.S. Air Force Photo/ Staff Sgt. Jeffrey Grossi)