Why do all Water Trial speedrunners have the same "hands behind" position when running? Is it for good looks, or is there a gameplay advantage?

为什么所有水上试跑者在跑步时都采用相同的“手放在后面”的姿势？是为了好看，还是有玩法优势？

因为那个站姿很帅 Because that standing posture is very handsome

It's the Chibi mask that is doing that.

No, you don’t run the water trial with the chibi mask.