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Ross Clifford is a chartered physiotherapist with a lifelong interest in human movement and function who draws on his knowledge of sport and exercise science to supplement his therapeutic approaches. As an experienced lecturer in physiotherapy and sport science, Clifford strives to convey technical information in a clear and accessible way.

Ashley Kalym is a personal trainer and author who has a long and varied training history. He has spent time playing rugby at a high level and training in the Royal Marines, and he now enjoys pursuing, learning, and writing about fitness and strength training. He is the author of many books on exercise and fitness, including Complete Calisthenics.