[Sidekick Martial Arts & Fitness | Best Martial Arts & Fitness Club In New Jersey Sidekick Martial Arts & Fitness is the best martial arts & fitness club in New Jersey. We offer martial arts programs for children which includes a mix of taekwondo, kickboxing, Brazilian jujitsu, muay thai, Kali martial arts & strength training. We also fitness programs specializing in kettlebell fitness for adults.]