Found another way to crack my back.
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 Was at the gym and was working on my obliques with the twist machine: http://www.exrx.net/WeightExercises/Obliques/LVTwistLower.html With one of the twists, my back cracked from bottom up! Ahhhh! 
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 Right?!?! I just did that a few days ago. Amazing! 
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 Nice one! I've tried it in an ordinary chair but my back won't go. It must be the extra resistance of the weights that does it. 
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 Nice one! I've tried it in an ordinary chair but my back won't go. It must be the extra resistance of the weights that does it. Do it on a chair with arms. Brace yourself with both of your arms on one arm of the chair put your legs on the other side and just make a quick jerking motion with your back. It should crack from the top to bottom. 
 The other method would surely crack your lower back easily!
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 sam bodmer has ruined my life