When Tigger was tested he ended up sitting on the arm of the chair and I don't mean a lounge chair - the skinning office type!
His psych said the constant need to move, fidget, kneel, swing, bounce etc is called a need for 'proprioceptive input' - the way I understand it the brain needs to feel the motion in order for him to concentrate effectively. At school he has a 'move n sit' cushion which is designed to help him sit at his desk but still experience movement but he generally still ends up standing, kneeling, moving around etc to do his work. Mat time is especially difficult for him but his teacher is very aware and chucks him a squishy ball to fidget with to help keep him on track.
Not ADHD just the brain needing to be fed all the time! If you google proprioceptive input you'll get the proper science on it.
