The seated military press, also known as the seated overhead press, is an effective exercise for targeting the muscles of the shoulders, triceps, and upper back. It primarily focuses on the deltoid muscles, but also engages several other muscles for stability and support. Here are the main muscles worked during the seated military press: 1. Deltoids: The deltoid muscles are the primary muscles targeted during the seated military press. They consist of three heads: the anterior deltoid (front), m