The Guide to Fitness book is mainly light blue in color with the text written in pink. Richie Salmons is also seen excising on the front cover as well.
Patrick thought the library was going to take his overdue library book, because a man in a suit came to his house. Patrick ran to SpongeBob's house to burn the "evidence." It was a book written by Richie Salmons, a parody of American fitness personality, Richard Simmons. It's probably a book about fitness.