Sjögren, T., Nissinen, K.J., Järvenpää, S.K., Ojanen, M.T., Vanharanta, H. and Mälkiä, E.A., 2006a. Effects of a physical exercise intervention on subjective physical well-being, psychosocial functioning and general well-being among office workers: A cluster randomized controlled cross-over design. Scandinavian journal of medicine & science in sports, 16(6), pp.381-390. The average training time of 5 minutes per working day decreased the prevalence of headache, neck, shoulder and low back symptoms and alleviated the intensity of headache, neck and low back symptoms among the subgroups of symptomatic office workers.