The Matrix Principle is a breakthrough in weight training for everyone who wants to build a healthy and muscular physique without the use of harmful drugs. Drawing on the most recent advances in exercise physiology, this book explains how and why muscle growth takes place, and why some forms of exercise are more effective than others in fostering muscular development. The book asks questions such as: is weight training beneficial to children and older adults? what kind of diet best promotes muscle gain? what are the effects of anabolic steroids? The book aims to give clear and comprehensive instructions on the most effective methods of aerobic, isometric and isotonic weight training, and introduces the exercizer to the Matrix System - a complete set of workout routines for each part of the body. Each matrix or set of routines is organized into stages to cater for trainers at all levels: amateur and professional sporting teams around the world are using the Matrix System with astonishing results as a safe alternative to drugs; contest-winning bodybuilders have achieved greater muscle gain through Matrix training than with any conventional exercise method; and for exercizers who simply want to improve their general fitness and muscle tone, the instructions and photographs make it easy to follow the programme individually. Professor Ronald S. Laura is currently Professor in Education at the University of Newcastle (Australia) and Chair of the Sports Medicine & Education Committee, Hunter Academy of Sport. He is well known around the world as a bodybuilding judge and commentator on the sport. Professor Kenneth R. Dutton is Pro-Vice-Chancellor and Dean of Students at the University of Newcastle (Australia). He has extensive experience as a weight-trainer and instructor and has successfully coached young bodybuilders for competition..