I was just watching a documentary about Gene Kelly, who my mom always loved & who I came to love watching as well, and they mentioned that in 1958 he did a TV show called Dancing: A Man’s Game which basically showed how the movements and timing of sports were much the same as the movements and timing of dancing.
Interestingly, Kelly wanted to be a Pittsburgh Pirate, and only accidentally (or incidentally) became the dancer and movie star he was.
Still, the documentary asserted that Kelly is the one who re-defined dance to include not only athleticism but a blue-collar masculinity, evidence by his own quote:
I didn’t want to move or act like a rich man. I wanted to dance in a pair of jeans. I wanted to dance like the man in the streets.
Betty did a part a long time ago where he had to leap up on a desk and sing wearing a pair of jeans; his character was a union organizer, and it was the actual musical called The Cradle Will Rock (that the Tim Robbins movie is about). & Yes, it was probably my favorite part he ever did (though in a three-way tie with Algernon and Macheath).