Primal Gym is the Top New South Jersey Facility for Mixed Martial Arts, Boxing, Kickboxing, Fitness, and Self-Defense Located Right Off Exit 8A on I-95 in Lawrenceville/Princeton, Primal Gym offers a state of the art facility providing the perfect family friendly training environment for everyone. Whether you just want to get in shape or train for the ring or the cage, we can tailor the right program for you.