Why does player characters walk like they are holding a poop?

[Tahaan]

The Zombies and animals have a much better walk animation. But the players just look silly, weird and sub-par by comparisson.

I guess with such terrible walk, run and climb animations, it is a bit much to wish for the character to change posture when weilding a heavy weapon like the machine gun or sledgehammer!

Loving the game regardless.