I mean, I've been trying for 30 years of my life and haven't been able to, so yeah, no idea how you'd go about it.
Then again, maybe it gets easier with other muscles as you practice and master more things - could it help overall coordination, maybe improve typing speed or balance?
Unsurprisingly, hands are very popular.
Other things like proprioception of our backs and general posture can go unnoticed even as adults. I.e. it takes careful focus and training to [re]learn how and what to move.
Such abilities are latent in all of us, differences in brain function that paralyze or confuse any part of the body are very rare.
You, too, can pull off an arched eyebrow like The Rock, do ear wiggles, crazy eye rolls, and more. Getting good at it seems to be a matter of methodical practice.
Yes, but I can practice moving my eyebrows to achieve mastery, because I know how to move them at least a little bit. With my ears, I literally cannot - no matter how hard I think about it or how much I strain, they just won't move. So how can you practice something that you cannot do at all? Just "try harder"? I feel like that's like telling someone with no legs to practice walking.
Or maybe there's a genetic component, like tongue rolling. The nerves and muscles are there, no sensation seems to be lost, they're just arranged a bit different.
Kinda cool how something trivial can go into these weird rabbit holes, anyway.