This is the 5th (15-year anniversary) edition of this book, and it has been redone from top to bottom. This book is for busy people who can only spare 5-10 minutes for a workout. It has 5 different routines that take roughly 5 minutes to perform. The exercises were selected so it does not matter what is your fitness level. You could be doing weight lifting and in need of some stretching the next day or you could be someone who does not exercise at...