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When we think of stress relief, we often envision the simple relief of a physical knot being untied. However, true relaxation is a complex biological recalibration. To understand how treatments at a wellness spa  function, we must look beyond the surface and into the delicate chemistry of the human nervous system. Switching off “Fight-or-Flight” At the core of the stress experience is the Sympathetic Nervous System (SNS) , or the "fight-or-flight" response. Chronic stress flo