A system that facilitates management of physical activity by dynamically compensating for current conditions is provided. A user profile can be employed to automatically calibrate an activity device (e.g., treadmill, cycle, haptic brace) based upon characteristics and/or limitations of a user. User activity and other data (e.g., physiological data, motion data, environmental data) can be monitored and employed to dynamically recalibrate the activity device in an effort to optimize performance. Additionally, a simulation profile can be employed as a benchmark for performance. For example, actual user activity can be contrasted against the simulation profile in order to provide feedback, motivation, or even to facilitate dynamic calibration of an activity device throughout an exercise regimen.