Here's the problem... beginner in what? Martial arts aren't a singular approach, systems that focus on striking will require different muscle groups to be targeted than one that focuses on throwing... same again for weapon arts. Then you have cultural influence and effect on the systems as well, with different arts having different emphasis and ideals coming from different cultures and geographic locations. Asking for a book for beginners for all martial arts, especially focusing on physical aspects, is like asking for a book for a beginner that covers all languages.
That said, if you aren't sure what system you're going to be training in, then basic physical fitness, cardio, and flexibility should be your focus... just don't expect it all to be equally applicable to all systems, as that's not how things work.