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As a general rule, if you are capable of doing something without pain or tools, then you are automatically OK to do it. In other words, cleaning out your ear with your car key is suspect because it involves a tool. Poking your eye with your finger is suspect because it involves pain. Locking your knees involves neither, and as long as you don't just stand there doing it for half an hour (at which point you should feel pain from your feet for bearing your weight without moving for that long, if nothing else, therefore making the activity suspect again), you won't suffer any ill effects from it.
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