Comprehensive Guide to Observational Gait Analysis: A Practical and Scalable Protocol Using Mobile Device Video 1 Intro Overview of Gait Assessment 2 Core Setup The essential requirements for any gait evaluation 3 Basic Setup The simplest setup for any clinic: one smartphone & one operator 4 Advanced Setup A more robust configuration for higher-quality data, reliability, and accuracy, still using low-cost tools 5 Measurements Step-by-step measurement guidance to improve precision using accessible tools.