New vids from Baguazhang Master and lineage holder He Jinghan.
He presents Tai Chi whole body movement better than most Tai Chi people out there. It's in Chinese, but I think that you could still watch and learn.
Moving from the spine:
https://www.youtube.com/watch?v=1UGUpFxHbNw
"Peng" and whole body structure
https://www.youtube.com/watch?v=Tv0kvH-qPeg
Apps:
https://www.youtube.com/watch?v=mXGQP9j4ITE
There's a whole lot of new Tai Chi vids on the channel you can watch, especially interesting if you understand some Chinese.