Not cracking as in 'excellent'. Cracking as in 'cracking fingers'. Until a few weeks ago it hadn't even occurred to me that the joints between the ribs and the sternum might crack at all*, but unless my sternum (which is where the cracks actually sound/feel to come from) can crack by itself, it must be them.
* in fact until I've just looked it up now I thought there were no joints, that the ribcage including the breastbone was just one solid bone, like a red deer's antler - so much for what I still remember from biology lessons ...
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