"Get ready to break a serious sweat with this scientific guide to HIIT training! Discover everything you need to know to achieve the best results from your HIIT workouts by understanding the muscle action needed to perfect each exercise."--
"Get ready to break a serious sweat with this scientific guide to HIIT training! Discover everything you need to know to achieve the best results from your HIIT workouts by understanding the muscle action needed to perfect each exercise."--