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I'm a big admirer of forced repetition. I've watch many people skill-up fast that way. I haven't done it much myself though.
I'm also a fan of forced constraints. This guy does what he calls timed posts:
The way these work is that if it takes me more than one hour to complete the post, an applet that I made deletes everything I’ve written so far and I abandon the post.
Somehow he still manages to write pretty involved posts within that hour, like his recent post of the Flynn Effect.

One of the things I want to get better at is writing and doing things like this is how I imagine I'd do it. Still, I haven't kept the habit longer than a couple days. In many ways my work life is already so strict that I want to break any other rule I try to set for myself.
applet that I made deletes everything
I'll definitely abandon work that I realize I'm forcing, but this is much more hard-core.
I consider writing on SN to be a deliberate practice (such as Anders Ericsson discusses in Peak), as it's the only place online I've been able to get sound feedback on what I write:
Perhaps the greatest difference between deliberate practice and simple repetition is this: feedback. Anyone who has mastered the art of deliberate practice—whether they are an athlete like Ben Hogan or a writer like Ben Franklin—has developed methods for receiving continual feedback on their performance.
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