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It means to do something rather than just talk about it. Talk is cheap, take action.Preaching - being talked to/yelled at. 
A coach/teacher obviously needs to verbally tell you what/how to do something, but you will learn more by actually doing it. 
This is why drills/problems are done over and over in sports/math so that you will have plenty of practice to learn. 
Basically, it is easier to learn by actually doing it vs being told how to do it.


it means  that practicing is better than whiling away ur time doing smthing not imp.