Guest Professor Wim Derave challenges prevailing views on muscle fiber types. He discusses non-invasive methods of estimating muscle fiber type and the effects of antihistamines on training. The podcast also explores the coexistence and variations in muscle fiber types, power requirements in swimming, measuring muscle fiber type composition in athletes, and the relationship between muscle fiber types and the risk of hamstring strains. It delves into muscle fibers and training adaptation, sex differences and age-related changes in muscle fiber types, and the importance of preprints and evaluating author expertise.