R.W.
Hi, my daughter started karate at four years old and loves it. She is not ADHD but she is very active. Zen Do Kai in Johnstown has a little dragons class for ages three to five. I'm sure there is one in Amsterdam. These classes are great for my daughter, they are once a week for 45 minutes. You can call around, most let you take a couple of classes for free to see if it will work out. Good Luck..