A simple knot may feel stable but it can overtighten when your subject moves, increasing pressure where you do not want it. A reef knot (or square knot) is a quick and easy knot that will not overtighten. Once you tie it, it will not tighten any further, so if you have allowed a little give to begin with it will not cause restriction of circulation.
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Cross the LEFT trailing rope over the RIGHT
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...and under it and feed it through
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Now cross the RIGHT trailing rope over the LEFT
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...and under and feed it through the loop
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This is how it should look before tightening
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Pull both ends to tighten. It will tighten at the point you have tied it, and no further, no matter how hard you pull on it.
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