The one inch punch Bruce Lee demonstrates in the vid is based on the Wing Chun punch. Part of the secret is the way weight is transferred from the rear foot to the fist as contact is made with the target.
Bruce Lee's senior instructor Dan Inosanto was asked about the one inch punch. He said for demos, the power of the punch is modified so that it becomes more of a push, instead of a punch. However, he did say that in real life, if he needed to use this punch, he would use full acceleration on contact so he could drop the opponent where he stands.
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