I disagree, I am not double jointed in any way whatsoever, but I crack all the time. I think it's because I've always been pretty flexible and I just like the sound and feel of cracking. 
I
Posts made by Isle_of_view
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RE: Possible correlation between double-jointedness and crackingposted in Joints in general
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RE: Backposted in Joint cracking The advice you about using a partner to crack your back was wonderful, and my back feels so much better now!!! Thanks!