The purpose of the single leg medicine ball overhead pass is to build endurance in the small muscles of your shoulders while maintaining a stable connection along your kinetic chain. (blog.bridgeathletic.com)
No amount of exercise can guarantee staying injury - free, but keeping the important muscles of the shoulder strong can greatly decrease the chances of problems in the future. (sportstarsmag.com)
The major muscle of the shoulder is found on the sides of the chest and wraps around the back under the shoulder blades. (ironmanmagazine.com)