I've had a bit of insight into this, through some exposure to a program that attempts to treat ADHD, Aspergers and Dyslexia. The program is based on the premise that these conditions are caused by an underdeveloped cerebellum, and provides a program of exercises that are specifically designed to develop this part of the brain.

One of the tests they do in diagnosis and progress assessment is a basic "standing still" test, performed on a platform with computer-monitored sensors, and several of the exercises involve simply standing as still as possible for a few minutes.

They find that over the 12-24 months the candidate participates in the program, as their ability to stand still increases, the extent to which they suffer from these conditions diminishes.

As I'm sure many here would attest, people with ADHD, AS and Dyslexia often have above-average IQ scores, but struggle with school performance or endeavors that require similar strengths, like conventional office jobs.