Prof. Dr. Beat Knechtle works as a scientific assistant at the Institute of General Practice and for Health Services Research at the University of Zurich, Switzerland. In 1991, he finished his medical studies at the University of Zurich and then completed his education as a primary care physician. Since 2004, he has worked as a primary care physician at the Gesundheitszentrum St. Gallen. Since his youth, Dr. Knechtle has trained in swimming, cycling, and running. He has completed many swimming, cycling, and running races as well as triathlons. Among his best achievements, he won a Deca Iron ultra-triathlon in 2013, covering a total distance of 38 km swimming, 1800 km cycling, and 422 km running. Dr. Knechtle is interested in performance analysis of endurance and ultra-endurance athletes, sex differences in athletic performance and nutrition, fluid metabolism, and energy turnover during ultra-endurance performance.