Are you Ninja ready? If you own our Katana Ninja frame already, and would like to increase the length of it, or add another run beside it, you will want to purchase one of Katana Ninja Frame Add-On Sections. Made with 4? x 4? steel trusses, our “Katana” Ninja frame accommodates dozens of AG Ninja obstacles to give your gym countless Ninja training possibilities. The Katana frame is versatile enough for younger athletes, but yet heavy-weight and sturdy enough to withstand former college football players at 6’3? and 230lbs running through our courses. (Obstacles sold separately).