​Freestyle Biomechanics: The Science Behind The Strokes, a book authored by former University of Hawaii swimming coach Jan Prins, is now accessible on Amazon. While the primary emphasis is on freestyle technique, Prins notes that the work also addresses the three other competitive strokes. Prins, who earned a Doctor of Philosophy in kinesiology from Indiana University in 1978 and remains on the faculty at the University of Hawaii, explains that the book comprehensively covers every aspect of freestyle movement. Topics include stroke pattern, body position, flutter kick, hand entry, recovery, and a wealth of related details. This publication represents the culmination of nearly five decades spent coaching, presenting, researching, and leading video workshops for competitive swimmers and coaches. It is designed to serve as an ongoing, go-to reference for swimmers at various levels, including triathletes and adult athletes seeking to optimize their freestyle performance. Garry Rodrigues, a swim consultant for USA Triathlon ahead of the 2028 Olympic Games, asserts that the book will become a staple on the shelves of swimmers and coaches alike, reinforcing its value as a continuous reference resource. The content delves into the biomechanics of the stroke with a focus on practical application, helping readers translate scientific principles into actionable technique improvements. From analyzing stroke cycles and body alignment to refining kick mechanics and entry timing, the book provides a detailed framework for understanding how each component contributes to speed, efficiency, and propulsion in the water. Prins’s research-backed approach integrates clinical insight with real-world coaching experience, offering readers a bridge between theory and practice. The book also explores nuances of propulsion efficiency, energy conservation, and error correction, equipping swimmers to diagnose and adjust faults in their freestyle technique. While the primary target is freestyle specialists, the volume also touches on how principles of biomechanics apply across the four competitive strokes, giving readers a broader perspective on overall swimming mechanics. Readers can expect structured guidance on optimizing technique through systematic assessment, deliberate practice, and reflective feedback, all grounded in Prins’s observations from decades of coaching and professional development sessions. The publication stands as a comprehensive resource for coaches seeking a solid, science-based foundation for teaching and correcting freestyle technique, as well as for athletes who are motivated to deepen their understanding of the biomechanical factors that influence speed and efficiency in the water. In summary, Freestyle Biomechanics: The Science Behind The Strokes offers an authoritative, research-informed look at freestyle swimming mechanics, with practical tips that can be implemented by triathletes, adult swimmers, and competitive athletes aiming to elevate performance. Its availability on Amazon makes this valuable reference readily accessible to a broad audience, reflecting Prins’s four-decade commitment to advancing the sport through education, experimentation, and hands-on coaching insights.