Using standard 3ds Max scale transform tools, you can adjust a biped's posture by scaling the size of its links. You must be in Figure mode to scale the biped links. If you try to scale a biped without going into Figure mode, nothing happens.
To scale a biped that has a mesh attached to it by using Physique:
Select the biped.
Motion panel
Biped rollout, turn on
(Figure Mode).
To reinitialize a scaled mesh:
Reinitializing a scaled mesh might be necessary if you use Initial Skeleton Pose in Physique. In this case, the mesh appears at its size before scaling. To correct for this, perform the following steps:
Modify panel, either make Physique inactive, or highlight the skin object so the active level is below the Physique modifier
in the stack.
Scale and
move the mesh until it matches the biped or bones.
Reinitialize with Initial Skeleton Pose turned on.