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Understanding Muscle Function and How They Work 
There are over 600 muscles in the human body. Understanding muscle function and how they work will help prevent injury to your muscles and keep your muscles strong and working properly for years to come.
http://www.bodybuildingtoday.com/bodybuilding/understan
ding-muscle-function-and-how-they-work/
ding-muscle-function-and-how-they-work/
