Sciatic muscle pain can be caused by a variety of conditions, many of which have a muscle imbalance at their roots. Muscle imbalances could be caused by either the over tightening of a mobility muscle (usually a large muscle or muscle group that keeps you moving) or the weakening of a stability muscle (a muscle that controls movement or joint position and often works against gravity.) Mobility muscles have a tendency to shorten with under use or under-stretching, while stability muscles
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