Ultimate Ninjas in O'Fallon, located in Chesterfield, Missouri, is a premier Ninja gym that offers a variety of programs for kids and adults. For kids, they provide fitness classes, preschool classes, open play sessions, birthday parties, after-school programs, and summer camps. The classes are led by experienced American Ninja Warriors who train to conquer the same obstacles seen on the popular TV show. They focus on building self-confidence, agility, and overcoming obstacles. Adults can also join fitness programs or participate in UNAA competitions. The gym is known for its positive and supportive environment. Overall, Ultimate Ninjas provides a fun and engaging place for both kids and adults to learn balance, coordination, and perseverance.

Ultimate Ninjas has become one of the best destinations for kids' birthday parties in the area. They offer a unique and active party experience with indoor obstacle courses and a private party room. Parents can easily plan a birthday party by making online reservations. In addition to birthday parties, Ultimate Ninjas also offers family open gym sessions where parents can participate in Ninja activities with their kids. The gym also organizes summer camps where kids can learn how to tackle obstacles like those seen on American Ninja Warrior while having fun and building endurance. With its positive environment and experienced instructors, Ultimate Ninjas is an excellent choice for families looking for an active and exciting experience in O'Fallon.