The PSO-AS muscle is widely considered to be the soul of your body. It stimulates our fight-or-flight response, provides support to our digestive organs, has a hand in the quality of your breathing, and a whole lot more. 

Common symptoms of a tight PSO-AS muscle include low back pain, gut problems, chronic stress, disrupted breathing, and fertility issues. But on the plus side, there are a ton of ways to attain relief. 

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