There are a handful of books in my library that I consider irreplaceable - and this is one of them. If you haven't read anything by Timothy Ferriss ( his book "The Four Hour Work Week" or his Blog) then you should start with his newest book called "The Four Hour Body". It contains enough information on weight loss, conditioning and performance enhancement to keep you busy for years to come.
NOTE: pick it up on Amazon or Barnes and Noble for significantly less than it's cover price. Regardless - it is well worth whatever you pay for it!
BTW - Tim is not only an author but a longtime martial artist as well with training in BJJ, Muay Thai, Kung Fu and other systems.