> Your mouse sensitivity should be very low.
> Use your elbow and shoulder only for aiming.
What in the WHAT?!? As a fellow 40+ year old gamer, who's played more Q3A and UT4 AND Counter-Strike than I'd care to admit, I've never heard or scene this strategy. You must be very entertaining to watch with all the ...flailing about!
UPDATE: I watched some YT videos of competition and while there's no "flailing" there's definitely increased arm movement. TIL thanks guys!