Annotation This methodical material provides a comprehensive framework for the computation and interpretation of walking and running spatiotemporal parameters derived from consumer-grade wearable technology data (Fitbit Charge 3,4 wristbands) supplemented by the walking and running biomechanical data from the 4HAIE study. The document outlines a methodological approach for sequencing, analysis, and computation of combined data from inertial and optical sensors, focusing on extracting running/walking metrics such as stride length, covered distance, and pace. Particular attention is paid to algorithmic preprocessing, noise filtering, signal segmentation, and validation strategies relative to gold-standard biomechanical and Global Position System data.