When doing mat exercises, does it matter if the back is flat to the mat or keep the back neutral?
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Neutral spine is relative to the muscular imbalances an individual presents with. A person is not going to automatically have a neutral spine if he/she is presenting with super tight hamstrings or hip flexors. Neutral to that person may mean positioning oneself in the closest position to neutral that his or her body will allow and progressively helping that person get to anatomical neutral.