Natural Training 101

Studies for Benefits of Low Volume 
http://journals.lww.com/nsca-jscr/Abstract/1997/08000/The_Effect_of_Weight_Training_Volume_on_Hormonal.3.aspx http://www.ncbi.nlm.nih.gov/pubmed/16287373 

Studies for Benefits of High Frequency 
http://www.ncbi.nlm.nih.gov/pubmed/8563679

Thanks to Natty or Enhanced for the image