Doing, watching, marrying ballet dancers, any.
Used to do ballet when I was younger and loved it. I quit when I was 10 or so, because they wouldn’t let you just do 1 class per week, it was like once you stopped being a little kid you had to either devote your whole life to ballet or leave. This was a problem with other things I liked too, like swimming or gymnastics. It’s like it wasn’t allowed that you just did it for fun, you had to seriously pursue it competitively, and I’m neither competitive or made of champion material.
Probably a good thing I never set my heart on being a ballet dancer anyway, I passed the height and weight limit a very long time ago, and it seems like it can be a brutal job if you’re stuck in the corps.