Originally Posted by lateraldeath
I do feel this is nitpicking a bit much on the physics. Because if you want to talk about it like this, 3D maneuver in general isn't a practical solution. Especially with the speed, angling and momentum, most soldiers would have their faces splattered on walls and trees during training way before even graduating, and even if you are really good, no one's perfect and one mistake at all and you are dead. Not to mention the Levi spin kills would just be impossible.
I think in this universe the human body can take much more than ours. No doubt people died during the training but you can;t die easily in this show (aside from Titan deaths). For example both Mikasa and Armin have fallen from 5+ stories and just got up like it was nothing. Not to mention Armin getting smacked by the female titan and rolling on the ground hard for 20+ meters without breaking any bones. In the Attack on titan world, frailty of the human body is not an issue with 3d gear.