USA Ninja Challenge Katy is an obstacle course training program for children, ages 4 years through teens. Trained instructors guide the athlete through a curriculum built on a gymnastics foundation that helps build strength, agility, and endurance. Students master curriculum levels and then progress to a higher level of achievement. The obstacles at USA Ninja Challenge are fun and challenging and develop all-around athleticism. Every child will enjoy being a ninja and part of the ninja community.