The quickie explanation is extreme stretching causes microtrauma from forcing sarcomeres to produce tension at extreme length, where damage is most suspectible. By holding it for 30-60 seconds, you initiate the stretch reflex which increases the amount of tension in that area (and why DC is right in being so adamanat about *holding* it for 30+ seconds), thus boosting tension and therefore acute damage. There's some speculation about stretching activating gene expression with satellite cells. I think John Parrillo has the same beliefs in his training also...

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