Brazilian Jiu Jitsu is a martial art / combat sport based around ground fighting techniques and submission holds. The focus of BJJ is the skill of taking an opponent to the ground, controlling them, gaining a dominant position, and using a number of techniques to force them into submission via Joint Locks and Chokes.
Jack openly credits BJJ as the art that made him fall in love with martial arts - the way it was so openly tested in combat, and how BJJ is so technical but its techniques can be broken down into the most simplest form.
Jack had tried other martial arts growing up and always questioned the effectiveness of them but for BJJ, it was right there being tested, especially in early MMA like the first UFC and Pride FC events. Jack found BJJ in 2004 and has continued training ever since receiving the majority of his grades while in Brazil, including his Black Belt under professor Roberto “Gordo” Correa De Lima.