Physique

Physique is a modifier that, when applied to a mesh, allows the movements of an underlying skeleton to seamlessly move the mesh like bones and muscle under a human skin. Physique will work on any point-based object, including geometric primitives, editable meshes, patch-based objects, NURBS, and FFD space warps. It will attach to any skeleton structure, including a biped, bones, splines, or any hierarchy.

Note: For NURBS and FFDs, physique deforms the control points (control vertices), which, in turn deform the model.