The investigators propose a randomized controlled evaluation and comparison of the interventions to each other and to a waiting-list control group. Hypothesis: Healthy volunteers attending a two dayseminar will show significantly reduced psychobiological reactivity, decreased stress perception and less anxiety to a standardized psychosocial stress test compared to the waiting list group. A total of 64 healthy volunteers will be randomly assigned to one of the three groups. The efficacy of the interventions will be measured through the Trier Social Stress Test (TSST) to measure the psychobiological stress reactivity.