Spinal Cord Stimulation for Children With Cerebral Palsy

The goal of this clinical trial is to help understand spinal cord excitability in children with cerebral palsy compared to neurologically typical children. The main questions it aims to answer are: * What are the mechanisms of spinal circuit hyperexcitability in CP? * Can transcutaneous spinal cord stimulation reduce spinal circuit hyperexcitability? Participants with cerebral palsy will be asked to complete: * Movement and strength exercises * Mild, non-invasive stimulation on the back and legs that feels like a light tap. * Gentle, non-invasive tests that help us see how the brain and the spinal cord communicate with the muscles