Almost every gym has kids who have been diagnosed with attention-deficit hyperactivity disorder (ADHD or AD/HD or ADD).
Oroville Gymnastics created a class specifically for kids with ADHD, dyslexia, sensory processing disorder and developmental delays.
Therapy Yoga Gymnastics Rocks provides occupational and physical therapy for children with challenges or special needs.
Some coaches seem to be able to handle these kids, on and off medication.
Some coaches can integrate challenged kids into a regular class. That’s best for the challenged child, in my experience.
There’s a good thread on this topic on Chalk Bucket right now. I particularly liked one link from 1999:
Ronald L. Kamm, M.D. – Tips For Coaching A Child With Attention Deficit/Hyperactivity Disorder
related post – for hyper kids prescribe gymnastics not drugs
Gymnastics Coaching.com 