What is martial arts and what is the difference between Tae Kwon Do and Judo? Do you have to fight or be very strong to do martial arts? The Fact Lion book of martial arts is a detailed, easy-to-read book about a sport that many children are curious about. The book provides advice and inspiration for which sports suit you. Reading Lion books are easy to read and are suitable for children from seven years who will experience the joy of reading a whole book themselves.