Cover model author and fitness expert Justin Woltering explains the science behind muscle growth. Want the nitty-gritty details on muscle growth? Are you one of those lifters who's just got to know how things work? The day-to-day practice of training and eating may seem simple enough but there's a hell of a lot of complexity in the ways it all works. If you want to know WHY certain diets and workouts are effective – and how you can tweak your own routine for maximum results – read on! Anabolic and Catabolic – What They Really Mean Bodybuilders and trainers talk about 'anabolic'