It’s an unfamiliarity with moving your mouth and tongue and whatnot in a specific configuration. It is something you can practice, just as you can practice stretching to become more flexible.
Like, my first language is English, but as a small child my dad taught me the ü sound (it’s different than a plain u, more like an “uerh”) for fun. My tongue is in a subtly different spot when I pronounce “u” vs. “ü” and I only got there with practice.
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