Your son is running through the house at 92 miles per hour (you've clocked him with a State Patrol radar gun) and won't stop. Yes, he has ADHD, you know this, but you've asked and then told him to stop, and you could really care less about ADHD. You want this child to BE STILL.
In these circumstances it's easy to think your ADDHD child is being willful and stubborn. That really is probably not the case. Remember that ADHD comes with impulse control as a main component, and kids with ADHD sometimes just can't control themselves.
What to do when your ADHD child seems to be willfully disobeying you? First, take a deep breath. Count to ten if you have to.
Second, do whatever you can to redirect your ADHD child. In the case of running 92 mph through the living room, physically stop him.