The right side of your stomach? I had this problem until my trainer told me it was due to lack of core strength.. He explained it the right side is where the air " comes in". a rather weird explanation but one that gives you the idea of what he means. He then taught me how to breathe correctly ( rather painful experience at first ) using my core and not my chest and increased exercises focusing on my obliques.
I'm not saying that's the problem but I had a similar case and that's how I fixed it.
I'm not saying that's the problem but I had a similar case and that's how I fixed it.
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