Vovinam to demonstrate Vovinam publicly in Hanoi with his disciples in 1940, Nguyễn was invited to teach the art at Hanoi's Ecole Normale, and Vovinam gained in popularity. During the following years, political unrest increased throughout Vietnam; due to the system's nationalist political orientation, the art came under suppression. By 1954, Nguyễn had emigrated to South Vietnam, where he was able to continue to teach and establish Vovinam schools. After his death in 1960, Grandmaster Le Sang continued the development and international promotion of Vovinam until his own death on September 27, 2010. The first Vovinam school outside of Vietnam was
Sinanju (martial art) same name.) Early disciples of the art used weapons, but the later practitioners developed virtually superhuman abilities through the training as it became revised following the ascension of Master Wang, the greatest master of the art up until modern times. Sinanju training enables one to hold one's breath for over an hour, rip steel doors from their hinges, climb walls, dodge bullets (even at point-blank range), overturn a moving tank, outrun a car, seem invisible, overcome multiple opponents, and bring a woman to the heights of sexual ecstasy. According to Chiun, the other martial arts in the world (kung fu,