My DD did a LOT of freestyle disco at one time and could probably have done a fair bit of this routine
She is known as 'BendyWendy' ( her name isn't Wendy !! ) and has the most amazing natural and trained flexibility as I'm sure those who have seen any of her photos will agree ? ( there are a couple on Star Now )
I wouldn't say she is on par with someone who does gymnastics but such flexibility combined in a dance routine certainly does look impressive.
However, she now has to have her stretching exercises carefully monitored as her CAT scheme are less impressed with her bendiness and if she is serious about a career in dance then she needs to take care of her growing muscles and tendons and not put them under undue pressure by overstretching them.
DD understands this now and is much less flexible than she used to be because she isn't continuously overstretching.
We do still see people in freestyle dance who do the most jaw dropping moves with their little bodies and I can see my DD out of the corner of my eye looking wistful that she can't do it anymore whereas I now cringe at the potential damage they could be doing !!
My DD absolutely loved the video Deb - thank you so much for posting it.