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I crack my knucles, and I used to crack my toes. I liked the sound. I have a friend and she cracks her back. It makes like 8 cracks. She does it because it starts to hurt if she doesn't do it every few hours. She is trying to quit but she says it hurts if she doesn't do it. I am a bit worried for her, but at the same time I am in awe at her back cracking prowress.
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