Attention Deficit Hyperactivity Disorder (ADHD) has tremendous individual and societal impact, and the effectiveness of current standard treatments is limited. We examine a novel treatment that could remediate the core features of ADHD and thereby contribute to sustained improvements in behavioral control. This approach is motivated by mounting evidence that children with ADHD show difficulties with motor control, and that these motor deficits are strongly associated with the core behavioral features of ADHD. We employ Tai Chi, targeting improvements in well-established behavioral and physiologic measures of motor control, and with this, improvements in ADHD symptoms. The proposed study offers immense potential for the development of novel therapeutic approaches for ADHD with little risk of adverse reaction.