with recurrent low back pain and 15 (14 men and one women) with healthy back participated in the study (Table 1). All subjects were bus drivers in local city-traffic. Daily work- ing time lasted from 6 to 10 h including preparation of driving, approximately 5 h of driving with three breaks (lunch break and two coffee breaks). In addition to driving, drivers took fares from passengers and lifted luggage and baby carriages when needed.