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does anyone else feel that their core is really tight? I've been sedentary for a while and just doing light stretches, like lifting my arms back and arching my backwards to stretch my core makes me feel that my obliques and core is sewed shut. I also get this amazing light-headed, sort of like after you jizz feeling, if I stretch my core out hard. what do?

This is a programming forum, not a medical forum. Consult a professional so he can actually examine your abdomen. You could be stressed, take a muscle relaxant.