This exercise is a variation of the traditional military press that increases strength and density throughout the core complex and upper back region, while increasing overall stability. Unlike the military press, this exercise is done with feet shoulder width apart, which requires less core strength. Military press requires your heels to be pressed together.
Barbell Shoulder Press, Exercise Videos & Guides
How To Do Barbell Shoulder Press
Seated Barbell Shoulder Press - Muscle & Fitness
Bodybuilding's Forgotten Muscle Builder
Overhead press - Wikipedia
How To Do A Military Press
Barbell Shoulder Press - Muscle & Fitness
Build More Muscle With the Seated Overhead Press
Seated Overhead Barbell Press - Tips on Proper Form and Similar Exercises
MuscleWiki - Barbell Overhead Press - Shoulders