The author has devoted about 20,000 hours to the theory and practice of Wing Tsun. Another 10,000 hours he has dealt with various other martial arts such as Escrima, Brazilian Jiu-Jitsu, Karate, Tae-Kwon-Do, Savate, Muay Thai, and, at the Beijing University of Physical Education, with Wushu, Qigong, Chen Taiji and the Drunken Style. During the study of sports at the German Sports University in Cologne, the author played sports such as gymnastics, swimming, shooting, judo, German Tanztheater, dance, team handball, badminton, volleyball, athletics, gymnastics, and he also studied the Feldenkrais method and Yoga. Oliver Gross in keywords Diploma Sports Scientist (German Sports University, Cologne) Fitness instructor (Materia Teaching Institute) Mental Coach Wing-Tsun, Escrima, and Yoga expert - Head of Ip Man Wing Tsun Cologne - Ip Man Wing-Tsun and Escrima weapon management Teacher at the University of Bielefeld from 2008 until 2013 - Wing Tsun, Escrima, Tai-Chi - Self-assertion and self-defense training in school and extra-school settings Teacher at the German Sports University in Cologne from 2009 until 2011 - Living anatomy, perception-oriented training