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Get the best results from your HIIT sessions by understanding the muscle action needed to perfect each exercise. Explore the physiology of all the essential HIIT exercises, spins, and sprints, to master each movement with confidence and control. Recent scientific research shows that HIIT is the most efficient form of exercise for raising fitness levels, increasing cardiopulmonary health, and losing weight. Science of HIIT reveals the facts, with annotated illustrations that show the mechanics, the angles, the key muscle and joint actions working below the surface of each exercise, safe alignment, and much more. Look no further to achieve technical excellence in your practice and develop your own program of varied workouts, to optimize the benefits of HIIT to your body and mind.