The man was fast! I mean deadly fast!
-Brandon Lee
You can certainly train for speed. I think that speed is, number one a genetic factor, there are some people that are just gifted you know, they are fast naturally, But think that training for speed, on the whole is a question of muscle memory.
Speed as an individual movement is something that comes down to thousandths of a second. But once you're talking about speed with repetition of movements - like throwing punch combinations - you are dealing with muscle memory
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-Brandon Lee