Which principle is NOT commonly shared across different martial arts?

Teamwork is generally more specific to martial arts practiced in a group setting or team-based competitions, such as certain forms of karate or judo where opponents may work together in pairs for mutual learning, or in team events. However, it is not a universally applicable principle across all martial arts disciplines.

In contrast, timing, footwork, and coordination are fundamental principles that underpin most martial arts forms. Timing is crucial for executing techniques effectively and understanding an opponent's movements. Footwork is essential in maintaining balance, creating angles, and enabling effective strikes or escapes. Coordination is necessary for the fluid execution of techniques, combining movements, and responding to an opponent’s actions.

Thus, teamwork stands out as a concept that varies more widely between martial arts, making it the principle that is not commonly shared across different styles.