Re: Other theories are available
When dancing only, the legs/feet move.
I can't find it on line to provide a link but did anyone else on here see Richard Stilgoe & Peter Skellern perform "Michael Flatfeet"? It was a laugh - until - you - cry send - up of Riverdance during which they explained that they danced that way "because their arms had been decommissioned".
As they stated "they were careful where they said that".