This book has been approved by TWiEA - The World Isometric Exercise Association (www.TWiEA.com). This is the NEW 2021 updated 300+ page Bullworker Bible(TM) with big pictures, updated Bullworker(R) spring data and useful arrows showing the direction to apply the force and movement. The Bullworker Bible(TM) is the definitive resource guide for all Bullworker(R) users and is the companion book for The Bullworker 90(TM) Course. It is the complete science-based user-friendly guide of how the Bullworker(R) should be used properly to deliver maximum results. It also shows you how to effectively use the Steel Bow(R). The Bullworker Bible(TM) gives you all the information that you always wanted to know, but the simple wall charts and basic instruction manuals did not provide. It tells you about essential repetition-compression and speed control, correct breathing techniques, how Hooke's Law of physics applies to The Bullworker(R), and about correct biomechanics to deliver the best results. The Bullworker Bible(TM) is approved by the makers, and distributors of The Bullworker(R), at Bullworker.com. The Bullworker Bible(TM) is also the essential guide for all users of the Bullworker X5, Bully Extreme, ISO 7x, and the Bullworker X7. Required Equipment: A Bullworker(R) Classic, or a similar device. Recommended Additional Equipment: Steel Bow(R), Bow Extension(R) kit, 2 x Iso-Bows(R), and the Bow Extension(R). NOTE: The authors, Brian Sterling-Vete and Helen Rene Wuorio are exercise specialists who have worked closely with the NHS Innovation Team at the Greater Manchester Mental Health NHS Foundation Trust on two major isometric exercise trials during 2020. This was an outstanding success and they are now moving into a third much bigger trial before looking towards an expansion into more sectors of the NHS across the UK. TWiEA will be involved to conduct isometric exercise instructor training programmes for key NHS staff.