From the editors of &NFi;Prevention&NFi_; magazine -- the most popular healthy lifestyle magazine in the world -- comes this energizing and efficient workout, part of the &NFi;Prevention&NFi_; Fitness Systems series. Designed specifically for busy men and women who have a hard time squeezing exercise into their lives, this fat-blasting cardio workout combines strength training and abdominal flattening, all in one high-energy routine.