Glad you made that comment, Stig. I did not go down the rabbit hole to view the whole dance the first time...just viewed it now. Amazing for sure. Her ability to only use muscles she needs is masterful.
I am sure you know what it is to "lock" a technique. My teacher talks of only using muscles necessary for a given technique for best efficiency and it also allows other parts of the body to do other things (maybe parry of block with one hand while punching with the other...or cradling the baby softly with one hand while defending against an idjit with the other).
Thanks for the nudge...an amazing skill they both have. The man's movements are amazing, too...great synchronization between the two.