Traditional methods for assessing body size, shape, and composition rely on static 3D scanning, which does not account for changes during dynamic activities. This study explores 4D scanning technology, which captures volumetric and temporal data at 178fps, allowing for continuous tracking of body metrics. This approach is particularly useful in sports science, ergonomics, and medical diagnostics, where understanding the body’s dynamic response is crucial. The study involved a healthy woman performing gait analysis, with measurements taken in February and November 2023. Waist circumference (WC) and body shape index (ABSI) were dynamically assessed, revealing significant WC variations during motion, which influenced ABSI precision. Additionally, showing a dynamic digital human model (DHM) of the subject fostered greater self-awareness and encouraged healthier lifestyle habits, resulting in a reduced WC over the study period. These findings suggest that 4D scanning can revolutionize personalized health assessments by providing precise, dynamic measurements and enhancing body self-consciousness. This technology holds promise for early identification of health issues and more effective, targeted interventions.