Simply Aritz features the first day of a training course focused on individual close quarters battle fundamentals. The lead instructor, drawing on his experience from French special forces, explains the distinction between technical tool handling and tactical application in various environments. The training philosophy centers on using methods and equipment that have been tested in professional operations to solve practical problems.

Instruction emphasizes specific body mechanics and weapon positioning designed to manage reaction time and visibility. Trainees are taught to hold their rifles at a 45-degree angle in a compressed position, which is intended to allow their eyes to enter a space before the firearm. This approach helps the operator identify threats or bystanders more clearly while preventing the weapon or limbs from being detected first by someone inside a room.

The course covers the technical aspects of room anatomy, including how to navigate different door types and corner shapes. Instructors demonstrate footwork for clearing spaces while maintaining a stable stance and minimizing the body's exposure. The training uses a high ratio of instructors to students to provide immediate corrections and ensure that movement and weapon transitions are performed with consistency.