Pablo,
Don't ever jackhammer! You don't have the unique physiology of a woodpecker to protect yourself. 
http://www.nwf.org/gowild/kzpage.cfm...&articleid=188
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Severe, extensive DDD, considered inoperable by Dr. Regan, Lauressen, & some guy at UCLA. Severe foraminal stenosis (guess they can't operate!) and some spinal cord compression that Lauryssen would fix if gets outta hand.
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