Middle Back Muscle Pain

I am suffering from pain in my middle back on one side just 5" below the bottom of my shoulder blade.

It feels very much like a pulled muscle and it appeared the day after a 45 minute run, (I only normally run 30 mins at a time).  This has now happened twice.

Is this something to do with how I hold my arms? Is this normal?

I hold my hands roughly at sternum height.

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