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This study concerns the biomechanical computer simulation of the Active Motion system for car seats. This system can impose different kinds of small motions on the pelvis of the driver. Muscle activities were estimated for different parameters for the Active Motion using a musculo-skeletal model in the AnyBody Modeling System. The simulations suggest that a person using the Active Motion will not receive additional loads caused by the feature. Further, the Active Motion system might generate an average relative tension relief within a cycle up to 60 %. This avoids long-term static load, which might postpone or reduce discomfort. The average relative tension relief is most sensitive to pitch and roll amplitudes.