Get the best results from your HIIT workouts by understanding the muscle action needed to perfect each exercise.

Explore the physiology of more than 90 essential HIIT exercises, 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 cardio-respiratory health, and losing weight.

Science of HIIT reveals the facts, with annotated artworks that show the mechanics, the angles, the key muscle and joint actions working below the surface of each exercise, safe alignment, and much more.