Colin Stiefer is an American HYROX athlete, gym owner and coach. He combines Elite 15 race experience with his role as a lead coach at RK Performance, where he works with athletes on strength, confidence and performance. His 2026 results include fifth place in Elite 15 men’s singles at the Americas Regional Championships in Washington, DC, in 56:09. Stiefer’s work in the sport spans both competition and day-to-day coaching, bringing experience from his own racing into athlete preparation.
