I used to study, watch tv, or videos, work on a few computers, while helping my children with their homework.
Now I take the time to actually figure out what the other players are doing. I only play one, sometimes two games. It helps a lot also when playing in person, I will go over different scenarios that could be in play, in that I mean what cards do I think the others in the hand have. And their betting patterns on the different
hands. Playing live if you are trying to steadily go over different hands in your head, people won't know what you have in your hand. I not only figure my outs, I start to try and figure out different outs for the various hands that could be in play.
I can sit back and just watch different tourneys and different buy in amounts, see how different they play, or not.