The present pilot study investigates how bodily movement and mental motion interact during solving of different types of mathematical tasks. In an experimental study, subjects performed algebraic, geometric, and numerical reasoning tasks at three complexity levels under static and dynamic postural control affordances during sitting. Electroencephalographic brain activity was recorded at resting baseline and during all experimental conditions. Results support the hypothesis that bodily movement has a positive effect on cognitive processing of demanding cognitive tasks. Moreover, our results indicate that mental symbolic transformations are processed within a visuo-motor representation that is aligned with the mental representation of physical space.