Some historians of Jiu-Jitsu say that the origins of "the gentle art" can be traced back to India, where it was practiced by Buddhist Monks. Concerned with self-defense, these monks created techniques based upon principles of balance and leverage, and a system of manipulating the body in a manner where one could avoid relying upon strength or weapons. With the expansion of Buddhism, Jiu-Jitsu spread from Southeast Asia to China, finally arriving in Japan where it developed and gained further popularity.