>>143332
Both berserker- and zen-mode work. That depends on personality a lot.
Screaming and dancing around before a lift gets you psyched for it, and tends to make you stronger. That's scientifically proven. There's a reason so many warrior tribes did it, and why violent protesters and mobs do similar things.
I used to do these things but now I'm using zen-mode. When berserker-mode works, it works great, but if you cannot get yourself that psyched, you'll probably lose all your motivation and feel like crap instead. And if, for some reason, you lose motivation during the lift, like when it is much harder than expected, then there's the risk that you'll completely lose it and fail.
That there's god-tier athletes of both styles, and some who switch regularly, shows that both work well when they do work. Sigmarsson regularly boasted during events, Kazmaier worked himself into such a frenzy that his opponent during a sumo-match left the ring in a panic, but I don't remember Shaw or Big Z making much of a noise.