Background: Attention deficit hyperactivity disorder (ADHD) is a prevalent neurodevelopmental disorder characterized by diverse clinical manifestations including inattention, hyperactivity and impulsivity. Objective: The present study aims to investigate the effects of neurocognitive training (NT), a personalized and specialized exercise programme on symptoms, attention and dynamic balance in treatment-na & iuml;ve children diagnosed with ADHD. Methods: Fourteen treatment-na & iuml;ve children aged 7-12 years diagnosed with ADHD were enrolled in the intervention group. The NT intervention was administered weekly for 10 consecutive weeks, supplemented by a structured home exercise programme for 6 days a week over the same 10-week period. ADHD-related symptoms, attention and dynamic balance were assessed in pre-treatment, post-treatment, 6 months, and 12 months. Fifteen typically developing (TD) children, matched for age, underwent evaluation only once to establish baseline normative values. Results: Following the NT (post-treatment), significant improvements were observed in hyperactivity-impulsivity scores, oppositional-defiant behaviours and dynamic balance when compared to the TD children (p < 0.05). In the ADHD group, a significant difference was found in the long term (12-month follow-up) in hyperactivity-impulsivity, oppositional-defiant behaviours and dynamic balance (p < 0.05). Conclusion: The findings suggest that the NT yields favourable effects on hyperactivity-impulsivity, oppositional defiant behaviours and dynamic balance in children diagnosed with ADHD, with these improvements appearing to be sustained over the long term.