Some time ago i started my sessions playing nl2, and then moving to nl10 after a few hundred hands. Took me nowhere, and it's a pain in the ass when you run good only at the lowest stake. But i guess you can try it, it's better than warming up at the grat circus.
i think watching a DC short might have a benefit.
but watching a new serie is (imo) not verry constructive UNLESS you already see it.
but you shouldnt be learning new things right before playing.
you should be reviewing your mistakes in previous session, post some hands, discus some issues you are strugling with. Review a DC serie that you have already learned.
this is (imo) a good way to warm up (i do this in CASH games, not sure for SNG or TOURNEY)
but i think watching a NEW video might not be as good as you would think because you put a lot of new stuff in your brain and you forget the mistakes you made in precvious sessions and bring it to the new session.
this is in my opinion, wroks for me
oh yea, if your standard is 4 tables, start with 1 or 2 tables for like 10 or 15min and then add tables to start your real session
I watch a DC episode as warm-up, review my hands from yesterday (I do that too little) or I start by watching the games for 5 minutes to feel how they run, then I jump into the games.
as for sunday MTT's, before I start grinding the majors I usually start a few smaller ones to warm-up
Also, check out the pre-session routine part of this post:
Assuming you play SNGs, I imagine playing a couple at 1 level lower to your usually buy-in would be a good warm up. Also, +1 to starting out with a couple and gradually adding more, as well as, reviewing hands/forums discussions before you first session of the day.
I play cash games and I love to just watch tables and take notes before I start to sit down. Helps me identify the weaker players as well as warm up my poker thinking part of the brain.