Locomotor training approaches for individuals with an incomplete spinal cord injury (iSCI) have been established on the principle that the spinal cord can learn how to walk again if given the correct sensory inputs. Emerging evidence suggests that arm swing plays a crucial role in influencing leg muscle function, yet its integration into rehabilitation remains unclear. In this feasibility study, we aim to combine our expertise in biomechanics and neuromodulation to investigate the effects of transcutaneous spinal stimulation on brain and leg muscle activity in the context of gait rehabilitation.