I was at a dance hall the other day, and this young lady came floating in. It's hard to describe how she walked - just like she was effortlessly gliding. It looks easy, but anyone else would look like a moose trying it.
It's the result of a lifetime of ballet dancing. Probably 10,000 hours, at least.
I was just in awe.
Another incident: I was stepping out of my ride to the airport, and noticed another woman pulling her luggage out of the trunk of a car. I remarked "I bet you're a ballet dancer." She said "nope, I'm an ice dancer!" Funny I could tell just by the way she wrangled the luggage.
Not to counter your point, but you must have never seen moose moving at speed through a forest. They are astonishingly graceful and surprisingly quiet.
My daughter just stopped competitive dancing last year after essentially a lifetime. The impact of all that ballet on her posture is worth it alone. Also she's phenomenal at posing for otherwise unscripted photos; her smile is always perfect.
It's not just the 10,000 hours, it's learning it very young.
I am an ex-professional ballet dancer, and one of the things I always find interesting is that any experienced ballet dancer can instantly tell who trained as a child and who didn't solely by how they stand (literally not even moving) at the barre. But the thing is, children with only a few years of training under their belt will often show this good form, while I have literally never seen someone who started as an adult, even dedicated adults who take class 4-5 times a week, get rid of that "I started as an adult" posture.
As an example, I was actually quite impressed at how Natalie Portman really managed to "look the part" in her role as a ballerina in Black Swan. Still, she wasn't fooling anyone with training - even with just a simple port de bras (raising of an arm), you could easily tell she wasn't a dancer.