How Many Times Should You Train a Muscle Each Week? http://www.lookgreatnaked.com/blog/how-many-times-should-you-train-a-muscle-each-week/ Effects of Resistance Training Frequency on Measures of Muscle Hypertrophy: A Systematic Review and Meta-Analysis https://www.researchgate.net/publication/301578131_Effects_of_Resistance_Training_Frequency_on_Measures_of_Muscle_Hypertrophy_A_Systematic_Review_a