Spinal kinematic research has been hampered by the lack of standardized models due to the inherent complexity of the spine. This paper addresses this gap by proposing a novel model that utilizes a passive marker protocol that involved attaching 43 skin markers directly to the experimental subject. This eliminated the need for additional calibration markers. Marker placement was based meticulously on established kinematic protocols, physical measurements, principles of marker alignment, joint center locations, and embedded coordinate systems. The model defines a mobile, segment-based local coordinate system that aligns with the fundamental principle of using three non-collinear markers to analyze human movement. This approach allowed us to explore the relative motion between consecutive vertebral segments (11 in total) during performance of functional tasks in a gait analysis laboratory. Preliminary results, including kinematic data and the angular velocity of vertebral segmental compression, concurred with the relevant literature. Our work establishes a standardized model for analyzing spinal and lower limb kinematics that has the potential to significantly impact the field by facilitating comparisons across studies, promoting the development of new analytical technologies, and, ultimately, gaining a deeper understanding of spinal function in various populations and under distinct health conditions.