I've never heard of this before John, but it makes perfect sense. Your entire body is changing shape and the framework has to shift in order to continue to effectively do its job of supporting you. That is BOUND to cause pain and soreness, and nothing hurts worse than when you make your rib muscles hurt in my experience. I haven't done it from weight changes, but rather from a sudden torsion event like what happens when you are riding your horse straight at something at a good pace and they suddenly go sideways on you. 😱
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