I mention this in another post but the one inch punch is a parlour trick. Easy for anyone to do. Why do people keep talking about this. If you want I will explain why it's a trick.
How true my friend. If you can box properly, then you can do the one inch punch. It's not some mythical MA secret that can only be performed by the highest ranking masters. Saying that, you would be amazed at the number of people who've been boxing for years and still don't have the correct movement for power punching. Even in my class, there are only a few out of about twenty people who can move their bodyweight AND torque themselves correctly. I think it may have been more impressive when Bruce was doing it because the "classical" arts were predominant back then. Now however, there are a great number of people who have integrated boxing into their MA or have joined classes where boxing is already part of the curriculum.
Sticks n stones'll break my bones, but if I land the first one, you're in trouble!