Last autumn there was a podcast done with chess world champion Magnus Carlsen (in Norwegian) and one interesting thing he says is that he practices a lot but on

Last autumn there was a podcast done with chess world champion Magnus Carlsen (in Norwegian) and one interesting thing he says is that he practices a lot but only when he wants to otherwise it's meaningless. Of course there is a difference with skating and memorizing chess lines but the take-away is still there, if it's going to work you have to enjoy it.