SIMS Martial Arts Academy | 10th Planet Jiu Jitsu Waterloo in Waterloo, Illinois is a martial arts gym that focuses on providing quality jiu jitsu instruction. The coaching staff takes a relaxed yet technically focused approach to training, creating a welcoming environment for students of various experience levels including those transitioning from other combat sports. Parents appreciate how the training helps develop discipline in young athletes while keeping them engaged in the physical activity.