My Copy: 9781514109328 (image courtesy amazon.com) As a newbie to Jiu-Jitsu (and its seemingly half-dozen acceptable spellings), I felt like I needed an understanding as to how it all worked. However, this is not a "technique-book," but more of a "mindset-book." Mastering the 21 Immutable Principles is a thin read and deceptively easy to understand. But, … Continue reading Mastering the 21 Immutable Principles of Brazilian Jiu-Jitsu, by Paulo Guillobel