Traditional Eastern medicineand shiatsu are based on the basic setting that we all have the life energy that forms our physical,,emotional and psychological structure (by modern research we are energy) 
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The flow of energy can disrupt external trauma (injuries), other elements from the environment (cold, moisture, heat, microorganisms) or internal emotional factors (anger, anxiety, fear, tension).
In addition to these causes, the state of energy is affected by lifestyle, particularly inadequate nutrition, and lack of sleep and movement.
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The essence of shiatsu is touch - pressure. Finger and palms on certain zones and points of the body,, stretching and rotation of the limbs and joints, corrective interventions on bone - muscle structurestretching muscles and fascias (fine connective tissue), tools by which a shiatsu practitioner drives the life energy and allows free movement in the body .