What is the nature of external feedback in movement modification?

External feedback in movement modification primarily refers to information that is provided from outside the individual, which can include cues or insights that are not self-generated. When considering the role of coaches or trainers, they offer external feedback that is based on observation and expertise. This type of feedback is crucial for enhancing performance, as it can highlight areas for improvement that the individual may not notice themselves. Coaches often assess movement, technical execution, and strategy, providing actionable input to help athletes refine their skills.

By contrast, the other choices represent different forms of feedback. Technological devices that measure performance do provide valuable data, but that information is categorized more as performance metrics rather than direct feedback from a person. Feedback that originates from within the individual's own body represents intrinsic feedback, which is how a person feels about their own movements and performance. Changes in the environment might affect performance but do not provide direct feedback in the sense of corrections or adjustments to technique. Therefore, the role that coaches and trainers play in offering their observations and recommendations is essential in the context of external feedback for modifying movement.