What do we call the action of not fidgeting while in ranks?

The action of not fidgeting while in ranks is best described as self-discipline. Self-discipline refers to the ability to control one's emotions, behaviors, and desires in the face of external demands, in order to achieve a greater goal. In the context of a military or ceremonial setting, remaining still and attentive demonstrates respect for the formation and adherence to training standards.

Practicing self-discipline while in ranks reflects an individual's commitment to maintaining the decorum and precision expected in such formal scenarios. This level of control is crucial in military environments, as it helps maintain order and effectiveness during drills, ceremonies, and inspections. Therefore, the concept of self-discipline encompasses both the ability to refrain from fidgeting and the overall mental fortitude required to uphold these standards consistently.