In spite of low-back pain being a common affiction, its exact precipitation mechanism still elude clinicians and researchers alike. Epidemiological studies have shown that mechanical factors play a significant role in the onset of these symptoms. One such factor is the exposure of the spine to repetitive lifting, such as in an industrial workplace. A number of mathematical and EMG-based models have been formulated to determine the magnitude of loads in the spinal muscles and discs during lifting tasks. This study, an extension of these models, predicts loads in the various force-transmitting structures of the spine during dynamic back and leg lifting. The technique used and results obtained for dynamic back and leg lifting are presented in the following paragraphs.