USA Ninja Challenge is the perfect way for kids to stay active and have fun year-round! This obstacle course training program combines basic skill sets from gymnastics, climbing, cross training and track & field. Not only does it provide a great physical outlet, but it’s also an incredibly creative way to keep your kids engaged and interested. USA Ninja Challenge is open to boys and girls ages 4 to 17, so no matter what age your child is, they can join in on the fun. The sport of Ninja is quickly becoming the hottest way to meet the physical needs of today’s kids. USA Ninja Challenge is designed to help kids stay active and fit while having a blast. With its combination of gymnastics, climbing, cross training and track & field, your child will get a well-rounded workout and learn valuable skills. USA Ninja Challenge is open to boys and girls ages 4 to 17, so no matter what age your child is, they can join in on the fun.