Wing Chun is a concept-based traditional Southern Chinese Kung fu style and a form of self-defense, also known as "beautiful springtime", that requires quick arm movements and strong legs to defeat opponents. Softness and performance of techniques in a relaxed manner are fundamental to Wing Chun. Notable practitioners of Wing Chun include Bruce Lee, Brandon Lee, Jackie Chan, Master Peter Mogridge, Robert Downey Jr and in Bollywood Tiger Shroff and Salman Khan (in movie bharat).