This book was the first military fitness program that I followed. The results were amazing, in 8 weeks I went from 245lbs down to 205lbs and never looked back. I am now addicted to military fitness programs (books) and swear by them. This book is one of the best and so are the SAS. The program is well rounded with running, swimming, and weight training/calisthenics. There is even a section on self defense which is very handy. The professional program is a killer and I would suggest tackling the less intense programs first. If getting physically fit is your goal then you will have a hard time finding a better book! In fact the only thing tougher than this book would be to actually enlist in the SAS! Being a fitness writer myself (Backyard Sports for Kids), I can fully appreciate a book like this one and my hat goes off to John Wiseman on an excellent piece of work!