CDC study: https://www.cdc.gov/pcd/issues/2021/p...

Nick Walker training footage:    • Nick Walker | FIRST BACK DAY AFTER TH...  
Brandon Curry training footage:    • Brandon Curry's CRAZY Upper Chest Bui...  
Hadi Choopan training footage:    • Video  

Dr. John Campbell channel:    / campbellteaching  

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