The Chaos Bulk, The Fractal Fat Loss Guide, and The Cheat Day Survival Guide are PDFs compatible with ADOBE and other like PDF readers. They come in a .zip file, which most operating systems can inherently unzip.
This doesn't just happen. You have to make it happen. You have to retrain your body. And this is what An Athlete's Guide to Chronic Knee Pain is all about: a program designed to fix chronic knee pain that delivers a pleasant athletic side effect.