At times, you'll need to alter the fit of the hierarchy in the Physique mesh, or change its structure. To do so, you change the default, initial pose, which Physique uses as a reference for various operations, including reinitializing.
- For a biped, you change the structure in Figure mode, then reinitialize the Initial Skeleton Pose.
- For a Bones system with the HD IK solver, there is a Show Initial State checkbox in the Motion panel, on the IK Controller Parameters rollout.
- For any other hierarchy, use frame 0 for the initial pose. Be sure your animation does not affect the position of the skeleton in frame 0.
Procedures
To load a file created with different system units:
Select the object. 
Reinitialize with both Initial Skeletal Pose and Vertex Settings (the last checkbox) turned on.
Note: If the System Unit Scale has a value that is different from that of the file you are loading, 3ds Max prompts you to rescale the scene. If you do so, any objects that have a Physique modifier exhibit a double scaling. Do the following: