James de Lacey
James de Lacey is a strength and conditioning coach, sports scientist, and founder of Sweet Science of Fighting and Lift Big Eat Big — one of the most knowledgeable voices in sport-specific strength training. He holds a Master of Sport & Exercise Science with published research in the Journal of Strength & Conditioning Research, and spent a decade applying his expertise in professional and international rugby league and union before specializing in combat sports and athletic performance across tennis, rugby, and beyond.
James has built a reputation for cutting through training myths and delivering practical, science-backed principles that work at every level. He breaks down what athletes really need to know about building strength, speed, power, and resilience — from the role of intent and maximum effort to why consistency is the single most important factor in long-term development.