If you do too many sets for you personally, your body won't recover for a long period of time, like more than a week, and if you are having too litle rest between training the same muscle twice it's like driving a car with a faulty engine and not letting the mechanic have a enough time to repair it fully :P I know one thing, it varies from person to person, some people do 4 sets for muscle and its enough, some do 20. A professional bodybuilder once told me that something like 80% of bodybuilders overtrain 90% of the time.



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