Dr. Amen (wrote Healing ADD) lists some supplement strategies. Of course you should consult with your naturopath and/or physician before taking any supplements. Dr. Amen is a child and adult psychiatrist, and brain imaging specialist who's written several books on ADHD.

The effects of yoga on the attention and behavior of boys with ADHD

From the Journal of Attention Disorders 2004. Warning contains technical language that may not be suitable for people unfamiliar with medicalese. The group doing yoga showed a reduction in oppositional behavior, emotional lability (mood swings), and restlessness and impulsivity.

Yoga for the Special Child™

is a comprehensive program of yoga techniques designed to enhance the natural development of children with special needs including ADHD and Learning Disabilities. She's the author of Yoga for the Special Child

On a personal note, I've done yoga off and on for more than a decade and when I finish a class it definitely helps with my focus and energy. It gives me energy but a calm non scattered energy. Great for stress relief, body awareness and peace of mind.