removing the ragdoll "limits"

as you know, ragdolls are limited by their bones so you cant do stuff as rotating the head 180 degrees, however in a lot of garrysmod movies on youtube i have seen ragdolls being twisted in all sorts of ways with no limits what so ever.

how do i make them do that??

There might be an addon or a console command to remove that, but I’m not sure what it is.

TF2’s sniper can make his head spin trough his chest back to its original position.