What boxers lift weights?

http://en.wikipedia.org/wiki/Muscle_memory

It's not about simply learning how to do something, it's about practicing until the movement is executed with more and more efficiency. Any novice knows how to throw a left hook after a 1 or 2 lessons, but it takes repetition to be able to throw that punch well, with good speed, accuracy and power. The movement is learned quickly, the ability to execute the movement well is something that you have to work on. I mean this is some basic common sense.