According to Scientific Blogging (yes, I am a nerd) dancers DNA is different from the general population, even from athletes, who also need high levels of stamina. Here’s the article.
Apparently, dancers have a tendency towards spirituality expressed through movement and the desire to communicate this. My uncle was a ballet a dancer, which was something of a anomaly in Brisbane in the 1960s so he had to be really driven to dance.
I wouldn’t be surprised if they discover that writers have different slant in their DNA. All creative people are driven to create, otherwise why would they put up with the pain and lack of recognition? We certainly don’t do it for the money. LOL
