A martial arts school founded by Kame Sen'nin, the Turtle Hermit. The training revolved around endurance of extremely arduous routines whilst wearing a heavy turtle shell. The training allowed the body to become immensely powerful, so that when the restrictions were relieved the fighters abilities would shoot up to super-human levels. Training with weights was used repeatedly throughout the series, including in the form of heightened gravity simulators.
When Groundbreaking Science was released, interest revived the school and Kuririn took over Kame Sen'nin's role. Kuririn believed that human ability was best harnessed in the form of team-work and devised techniques that harnessed group efforts. His experience fighting along-side Earth's heroes for many years lead him to believe that alone, humans were incapable of standing up to aliens, but when working together, could conquer anything.