Participants undergo the same audio-guided body scan intervention. However, in this arm the instruction focuses on the positive effects of mindfulness-based interventions and body scan aiming to optimize participants' interventions outcome expectations of the intervention. The idea of this arm is to assess whether the effects of the mindfulness-based intervention can be augmented by boosting participants positive expectations prior to the intervention.

Participants in this group listen to an audio-book for the same duration as the participants in the two experimental groups.

The body scan intervention aims to raise one's awareness of one's own body. It is considered a relaxation, meditation or mindfulness intervention. During the body scan participants will walk through his or her body by focusing their mind on specific body parts without analyzing, judging or reacting.

Participants are asked to rate adjectives regarding their current mood (positive and negative) at two time points (baseline and after body scan or active control intervention) on a questionnaire. Change scores are calculated (post- minus pre-scores).

Instrument: Positive and Negative Affect Scale (PANAS) by Watson, Clark, and Tellegen (1988) is a self-report questionnaire that consists of two 10-item scales to measure both positive and negative affect. Each item is rated on a 5-point scale of 1 (not at all) to 5 (very much). Range for sum score of positive/negative affect: 10-50. For positive affect higher scores are better; for negative affect lower scores are better.

Participants are asked to rate how stressed they feel at the moment at two time points (baseline and after body scan or active control intervention) on a questionnaire (VAS: item ranges from 0 (not stressed at all) - 100 (very stressed). Change scores are calculated (post- minus pre-scores). More negative change scores are better since it indicates a stronger stress reduction (maximum reduction: -100). Higher positive change scores are worse since this indicates an increase in perceived stress (maximum increase: +100). Range of change scores: -100 - +100).