Objectives: We evaluated the efficacy of daily relaxation training on psychosomatic symptoms during one school year among 8-year-old children. Methods: Cortisol in saliva, abdominal circumference including body mass index (BMI), heart rate, rate pressure product (RPP), and stress in children (SIC) were measured. Teachers in the intervention classes were interviewed. The intervention consisted of a daily relaxation therapy (RT). Results: The intervention group showed reduced heart rate. Individuals of the intervention group showed an improvement regarding headaches and the ability to fall asleep. The qualitative results showed that the RT had a calming effect on both the children and the teachers. Conclusions: RT among children may be of use to cope with stress as interpreted by some improved parameters in the intervention group.