It's not that Debbie has just kept a degree of physical fitness - being taught dancing to such a high standard has a knock on in terms of so many different things - she knows the lingo, knows what's being asked of her, can retain a complex routine, has the muscle memory to keep straight arms or pointed toes, has the poise of a dancer. It's not like someone who did a few ballet classes in the church hall, she was with the Royal Ballet and Iran national ballet for years.
So, so unfair to people like Ruth and Susan who are true novices.