Fear of making participants re-live traumatic experiences

This is partly fear of hurting another, and partly a fear of taking on responsibility for something we have no control over (previous trauma), even though it is something we should be concerned with and take into account. It is important to me to make sure I inform people about any exercise that may provoke a powerful emotional experience or remind people of the pain they had suffered, and to remind them of the rule that participation is strictly voluntary. This is important in order to avoid putting people in unexpected or difficult situations. On the other hand, it is up to each participant to decide whether they will engage with something they find difficult.