Or if you're in a combat sport and you are in a fighting stance, don't advertise to your opponent that you're about to do a certain thing and then follow through with said thing.
Not related, but I was never got pinned via the half-nelson during high-school wrestling because my arms are real flexible.
That's always an advantage. The only telegraphing of moves one should be doing in a combat sport is when one is feinting, to make your opponent do something specific so you can more easily counter it.
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