But, since the animations were recorded by motioncapture with real actors, we can talk of biomechanics :p lol

Biomechanics is the science that examines forces acting upon and within a biological structure and the effects produced by these forces. Biomechanics addresses several different areas of human and animal movement. As examples, it includes studies on (a) the functioning of muscles, tendons, ligaments, cartilage, and bone, (b) load and overload of specific structures of living systems, and (c) factors influencing performance. The Biomechanics curriculum at the University of Calgary focuses on the mechanics of human movement with an emphasis on biomedical and sport applications.