When dissecting cadavers anatomists noticed that there are muscle groups that have more prominently connecting fascial lines throughout the body. This is helpful to know as a potential solution to injury, as well as in repatterning ideal movement. When if a trigger point or just an adhesion exist on one of these muscle groups- it is directly  effecting the rest of the muscles on that line. Therefore releasing any adhesions on the corresponding line will create slack in the entire line. 

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Its also helpful to see how entire lines tend to be either shortened or lengthened due to gravity and repetitive movement.  

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