Class InfoinSPIRE Rock Indoor Climbing GymNature/Outdoors, Rock climbing Class InfoMomentum Indoor Climbing - HoustonLEARN TO BOULDER, EXPLORE MOMENTUM, EXPAND YOUR SKILLS Class InfoUSA Ninja Challenge Sugar LandNinja classes are offered after school starting at 4pm - 8pm. Classes are arranged by the following ages: 4-5, 6-8, 9-12, 13-17. Classes are one hour long and offer a great work out for kids while they have a blast on all of our ninja obstacles!