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Side Plank Pain

Whenever I attempt to do a side plank on my right side, my shoulder hurts near the side delt. It feels very fatigued, like there is a knot inside it. Even if I force out one set my shoulder hurts for a good day afterwards. The pain sort of goes from the shoulder into the upper back region the next day.

Anyone have any ideas of what it is? It is only on one side…