The most successful performers are those who can adapt to environmental demands. Furthermore, runners who can smoothly transition into movement patterns in anticipation for an environmental change minimize energy expenditure and spikes in joint loading. The current research on running biomechanics in the environment only provides comparative knowledge rather than examining the preparatory and return patterns to changes in terrain that represent online adjustments and motor planning. The current study aims to determine how runners successfully plan and execute biomechanical changes in response to novel task and environmental demands.