Which factor is NOT considered an internal factor that influences performance?

When analyzing performance factors in biomechanics, internal factors are those that originate within the individual and include physiological and biomechanical characteristics. Strength, biomechanics, and muscle coordination all pertain to the individual's physical capabilities and neural processes that directly affect their performance.

Biomechanics refers to the study of the mechanical principles of living organisms, particularly the movements and forces involved in human motion. Muscle coordination is the ability to effectively use multiple muscles in synchronization to perform tasks, heavily reliant on neural control and feedback mechanisms. Strength encompasses various aspects such as muscle force generation, endurance, and overall physical capabilities, all critical internal factors in performance.

In contrast, equipment is categorized as an external factor. While it can significantly impact performance—such as the type of shoes worn, sports gear, and other assistive devices—it is not a component inherent to the individual. Instead, it serves as an external aid or obstacle that can influence performance outcomes but does not stem from the individual's own body or physiological attributes. This distinction is essential to understanding the classification of factors affecting performance in biomechanics.