“I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times.” -Bruce Lee
Focus, specialization, repetition. The keys to getting good at something.
And Bruce surely did focus on the step-in side thrust kick demonstrated above. This clip is from Way of the Dragon (aka Return of the Dragon), and as usual he’s wearing his traditional Chinese garb while surrounded by people wearing Japanese-style karate gi and black belts (Bruce didn’t believe in belt rankings), an ethnocentric theme running through a great deal of Chinese kung fu flicks.