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Writing, of course. If you want to write fiction, then writing fiction. Anything else might be helpful, but it's not practicing the actual thing you want to be getting good at. Reading might give ...
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Source: https://writers.stackexchange.com/a/3246 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/3246 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Writing, of course. If you want to write fiction, then writing fiction. Anything else might be helpful, but it's not practicing the actual thing you want to be getting good at. Reading might give you ideas, familiarity with structure and narrative convention, etc. etc. And writing emails and blogposts might give you some vocabulary, eloquence, clarity of expression perhaps - but writing needs to do much more, and entirely differently. Note that Gladwell says **a specific task**. Writing's got a whole lot of parts to it, sure, but however you break it up, there's an awful lot of those parts that really don't get exercised by anything but doing actual, real, honest-to-goodness writing. Worldbuilding, character development, crafting resonant imagery, pacing, plotting - these are all necessary skills you're not going to get anywhere else. (And no, reading somebody else who's done them is not the same, just as you can't start composing merely by listening to 10,000 hours of Mozart.)