Seth O'Neill, an Associate Professor in Physiotherapy at the University of Leicester, discusses the role of tendons in dynamic movements and tissue adaptation. He explains the importance of tendon structure and how it can be influenced by factors like aging. Seth also explores isometric training and its benefits for rehabilitation. He delves into specific tendons such as patellar tendons and Achilles tendons, as well as calf training and monitoring. Lastly, he highlights the increased occurrence of calf injuries in sports and the correlation between calf strength and sprint speed.