It is actually very difficult to externally rotate the hips as much as they do in ballet for some people that have never trained in it even if they can do the splits and had a lot of yoga
Balancing on only the toes instead of the whole foot is also challenging
These two features make ballet exercise unique compared too many other common types of exercise and uniquely different than many other types of dance
Princess Tutu is a Japanese Anime that goes into great detail about ballet style when people move
Even when they are running or dance fighting they run with the hips externally rotated like in ballet
If you like ballet I strongly reccommend watching Princess Tutu if you can watch the whole series for free
@shortstories Will check this out.
Storyline sounds similar to "The Little Mermaid" (1989)