Slsy Ninja Training Course are specially designed for kids over 4 years old. Upper Line can be installed more than 10 obstacles, and Ground Line can be used as a training line to improve strength and balance. Get your kids OUTSIDE and Overcome obstacles course of different difficulty in the most fun ways. Warriors never afraid of difficulties! Our kit has an exciting assortment of the most complete and fun obstacles. Kids LOVE it, and even forget about electronics (sometimes)! Whether you're a beginner slacklining for fun or a pro-athlet e looking to improve strength and balance, our ninja obstacles course is the perfect backyard challenge for ninjas of all levels. From Kids to Adults, and Beginners to Advanced. You could install it on your backyard, playground, home gym, basement, pool, fitness class, camping trip, beach park, etc. No More Worries about Your Kids' Health!