Avenge Jiu Jitsu - Judo and Jiu Jitsu Martial Arts training & classes in Denver. Jiu jitsu extends much further than just a martial art or self-defense program, it's a way of life. We help you to accomplish your goals while improving fitness. Men, women, and children are welcome to our academy. Weekly Martial Arts Class Schedules & Competitions. Our team has an impressive combined wealth of knowledge, and we provide a safe environment to hone your martial arts skills. For a free trial week of our gym, call or visit us on the north side of 8th Avenue east of Federal Boulevard. Off the I-25 and US 6 in Denver, Colorado.