-Just in case you didn't know
The 70's was a strange place...
I remember some English guy summing it all up in an interview at some point: "We'd all heard about how much television they had in The US. Turns out they did
have many more channels than anywhere else but most of the time it was just a bunch of people dancing to pop music in a TV-studio..."
The vid. reminds me of the infamous Bilbo Baggins
-video (even if that was
from the sixties).
ETA: The remarks on YT include some baffled people trying to figure out what is going on
That Ballet Zoom
seems to be selling lots of stuff; cats in ^that vid. and an exercise thingamagoo in this one: