Natural Bodybuilders Agree Shrugs Are the Most Effective Exercise for a Bigger Upper-Body Frame Pre-Owned The Kelso Shrug System: A Practical Guide for Body Builders... Kelso Shrug System The : A Practical Guide For Body Builders And Strength Athletes By Paul Kelso Kelso Shrugs Size Chart In Kelso's book, you will learn the basics of shrug-weight training and how to perform the many shrug variations, Trap Bar Training methods that will allow you to utilize the Trap Bar to its fullest potential