Systems, methods and program products for administering and modifying a simulation that incorporates the use of biometric data collection and computer-based predictive modeling techniques to reliably identify changes in the stress level of simulation participants while predictively adapting the simulation environment to manage each participants' stress levels within a pre-set or desired range. Each participant may have their biometric data collected and continuously monitored by wearing a computing device comprising biometric sensors, camera systems and audio recording devices. As the participants biometric data changes, the system monitors the participant for changes in stress level and maintains a desired stress level in the participant by modifying the adjustable properties of one or more virtual objects or computer-accessible real physical objects of the simulation environment to increase or decrease the stress level of the simulation on participants.