you know after 2 hours no body practice any more what i am asking you to do, you must spend 30 minutes even 20 minutes, even 1 hour even better training by yourself secretly in undercover way no body see you doing extra training for example you go home after 2 hour session with every body and then you want to make this tap technique, which you learnt today make it better yup, you bring racket or you don't have racket at home you bring a spoon, ya this is spoon, under arm chair ready change grip tap, ready change grip tap you spend 20 minutes and no body saw you did it next day when you practice backhand net kill your net kill will be 10% or 20% better than any body else with 2 reasons, why? you have practised mentally you have practised with your hands acutally so, when you actually practice next day you will totally believe you can do it better and you will be doing it completely positive way just imagine, every day you spend 20 minutes, 30 minutes by yourself when every body is watching tv after 1 month, after 1 year, if you save them the gap between you and the other player who just did 2 hours, is huge when you play against them, before you play them you already beat them, because you know you prepared more