In this PDF book, I include many blog posts from my network of fitness and martial arts blogs. I hope that the resources, especially the forums, will help you increase your understanding and answer any questions you may have. There are posts in this PDF file that have information and links about specificity in training, the strength continuum, Okinawan martial arts, free sparring, and more. I also include links to useful videos. For plenty more free resources, head over to my blog -
http://owenjohnstonkarate.com