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As others have said, it's bad practice to use the arch and heel because (a) it restricts motion when you're going for the next hold, because there's one fewer joint you can bend, and (b) it throws...
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As others have said, it's bad practice to use the arch and heel because (a) it restricts motion when you're going for the next hold, because there's one fewer joint you can bend, and (b) it throws...