culture in the form of rooftop fights. In the mid-20th century, soaring crime in Hong Kong, combined with limited Hong Kong Police manpower, led to many young Hongkongers learning martial arts for self-defence. Around the 1960s, there were about 400 martial arts schools in Hong Kong, teaching their own distinctive styles of martial arts. In Hong Kong's street fighting culture, there emerged a rooftop fight scene in the 1950s and 1960s, where gangs from rival martial arts schools challenged each other to bare-knuckle fights on Hong Kong's rooftops, in order to avoid crackdowns by British colonial authorities. Lee frequently participated in these Hong Kong rooftop fights. He combined different techniques from different martial arts schools into his own hybrid martial arts style. When Lee returned to Hong Kong in the early 1970s, his reputation as "the fastest fist in the east" routinely led to locals challenging him to street fights. He sometimes accepted these challenges and engaged in street fights, which led to some criticism from the press portraying him as violent at the time. Fitness At and weighing at the time, Lee was renowned for his physical fitness and vigor, achieved by using a dedicated fitness regimen to become as strong as possible. After his match with Wong Jack-man in 1965, Lee changed his approach toward martial arts training. Lee felt that many martial artists of his time did not spend enough time on physical conditioning. Lee included all elements of total fitness—muscular strength, muscular endurance, cardiovascular endurance, and flexibility. He used traditional bodybuilding techniques to build some muscle mass, though not overdone, as that could decrease speed or flexibility. At the same time, with respect to balance, Lee maintained that mental and spiritual preparation are fundamental to the success of physical training in martial arts skills. In Tao of Jeet Kune Do he wrote: According to Linda Lee Cadwell, soon after he moved to the United States, Lee started to take nutrition seriously and developed an interest in health foods, high-protein drinks, and vitamin and mineral supplements. He later concluded that achieving a high-performance body was akin to maintaining the engine of a high-performance automobile. Allegorically, as one could not keep a car running on low-octane fuels, one could not sustain one's body with a steady diet of junk food, and with "the wrong fuel", one's body would perform sluggishly or sloppily. Lee avoided baked goods and refined