Spark muscle growth by revamping your training split to train muscle groups at least twice a week! – http://muscle.ms/HiFreq_ pic.twitter.com/0AntQXHZ1g

Spark muscle growth by revamping your training split to train muscle groups at least twice a week! – http://muscle.ms/HiFreq_ 

First seen here > https://twitter.com/Muscle_Strength/status/847222006193954816

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