The motor system provides a locus for the integration of multiple neural systems, with clear abnormalities in inhibitory function in ADHD. An intervention targeting the motor system stands to make productive contact with these motor system targets. Indeed, there is broad evidence for the efficacy of Tai Chi (and other mindfulness-based movement training) in addressing a wide range of issues, including high level cognitive functions such as attentional control.2 The majority of these effects have been established in adults, but given the greater brain plasticity documented in children,1 we have reason to expect strong effects in children. Indeed, successes have been reported in child populations as early as preschool.32 Moreover, there is a recognized need for physiologic biomarkers in mindfulness and movement training studies.15 Our robust ability to track changes in specific motor markers at behavioral and physiologic (from TMS) levels, provides an ideal target measure to establish specificity in a Tai Chi training intervention.