In greenhouse horticulture, cultivation of strawberries is done on high racks, so-called gullies. The strawberry plants are at a height of 150-160 cm. To pull the blossoms through and clear out the plants, the workers usually walk on 30 cm high stilts. Because of the height and resulting insecurity, the workers walk with undue tension in leg and back muscles. This may lead to fatigue and discomfort. Furthermore, walking on the stilts implies a risk for falls, as the centre of mass is 30 cm higher than normal.