Analyses of schoolchildren and senior citizens demonstrate close links between physical activity and mental performance. The intriguing question is: does more activity at desks also mean that people concentrate better? The Centre for Health has looked in detail at the impact of Trimension® on performance and health. A comparative field study was carried out on 80 test persons in the offices of an insurance company. After the first measurements had been taken, the trial group received (n=40) ON office chairs. After three months, concentration performance was tested again. The results are unequivocal. The group on the three-dimensional office chairs had increased significantly over all concentration criteria (speed, accuracy and consistency). The control group on the other hand stayed at the level first measured.