This book has been approved by TWiEA – The World Isometric Exercise Association (www.TWiEA.com). Currently, the entire range of books written by Brian Sterling-Vete and Helen Renee Wuorio about the Bullworker, isometrics, and other related forms of exercise are the only books to have received this approval together with TWiEA’s 5-Star Rating. ISO90™ is a comprehensive and complete step by step 90-day/12-week body shaping, bodybuilding and functional strength building course based on the ISOfitness™ system of isometric exercises. The ISO90™ course is ideal for beginners, advanced trainers alike. Your natural Adaptive Response™ mechanism means that whatever intensity you apply at whatever level you’re at gives everyone roughly the same percentage of improvement. The ISO90™ course focusses the appliance of science in practical exercise and functional strength building, and in doing so, it makes the ISO90™ 90-day/12-week course, one of the fastest, and most efficient ways to get into shape, build muscle, and get strong which has ever been devised. The ISO90™ course allows you to benefit from a professional-level workout literally anywhere, and on almost any location. Each week will build upon the gains made in previous weeks, with clear instruction and pictures to demonstrate how each exercise should be performed. Required Equipment: 2 x Iso-Bows – available on Amazon or from Bullworker.com