I used to work with the co-author of the book Dave Honig. He was a gym teacher for 20 years in Queens and also worked as the fitness trainer for several pro boxers including current Heavyweight champ Oleg Maskaev. He's a nice and knowledgeable guy, but one look at his physique compared to LL's and you can see either he doesn't practice what he preaches, has terrible genetics, or LL is doing something that he's not doing.