Knuckle Up Jacksonville Jean Jacques Machado Brazilian Jiu Jitsu and Fitness is a Brazilian Jiu-Jitsu academy in Jacksonville, Florida, affiliated with Jean Jacques Machado. The school offers Jiu-Jitsu instruction for kids, teens, and adults, with training led by Professor David Werner, a black belt in the Jean Jacques Machado Brazilian Jiu-Jitsu lineage. The academy emphasizes self-defense, skill development, and a welcoming, family-oriented training environment.