Long periods of sitting and a lack of physical activity can be risk factors for a variety of diseases. Back pain in particular can be a consequence of a sedentary, physically inactive lifestyle. The Ergofox posture analysis is an occupational health management measure that combines the areas of sitting behaviour and movement by analysing the sitting posture with a depth sensor, creating an individual posture report and activating personalised coaching. To investigate the effects of this intervention, a controlled cohort study was conducted (N = 37). It was found that the intervention group stood out from the control group after the intervention and showed increased values in the area of physical activity in everyday life. Compared to the time before coaching, the participants walked more, cycled more, climbed more stairs and did more sport. An additional analysis (N = 132) of the standard questionnaire implemented in the intervention also showed a reduction in back pain, a reduction in the extent of pain and a reduction in shoulder and neck pain. Thus, the Ergofox posture analysis seems to be an effective solution. These results should be further substantiated in follow-up studies.