This is an interesting CCTV video on taiji, it's pretty long, but I think taiji people will find it worth watching.
https://www.youtube.com/watch?v=YSBAQWJuKsk
https://www.youtube.com/watch?v=GnE9Y-VsFgA
https://www.youtube.com/watch?v=D9RLO3QpDNM
https://www.youtube.com/watch?v=9AmjoJ2yyLs
One of the things I find interesting is that groups of muscles fired simultaneously on the taiji master which would tend to support the idea of "one part of the body moves, the whole body moves". It would be interesting to see more studies along these lines to see if the groups of muscles match up with the muscle tendon meridians (jing jin).