Visual Biofeedback in Flexibility Rehabilitation for Elite and Olympic Athletes: A Translational Review of Low-Cost Analog Guidance

Recovery in flexibility-dependent elite sport is often guided by symptoms, coach observation, and visual estimation, even though return to performance depends on precise re-entry into large-amplitude positions. This review synthesizes current literature on visual biofeedback, augmented feedback, motor relearning, psychological readiness, and end-range rehabilitation, and translates that evidence to Olympic disciplines in which flexibility is technically essential. The central argument is that feedback should not be treated as a luxury technology layer, but as a clinical method for standardizing threshold exposure, reducing ambiguity, and improving athlete confidence. A practical model is proposed in which low-cost analog guidance, including moire-based threshold signaling, complements clinician judgment and load management. This approach is especially relevant in settings that lack expensive digital systems but still require reproducible, visually intelligible recovery progressions.