Wao!!
![Applause](images/smilies/applause.gif)
its nice you are interested to work with ADHD children. Kids with ADHD needs special care and intention. So just prepare for this it will be a tough job. You need to be physically fit, but I don't think that you need any special physical training other then normal exercises, walk or jogging that normally we have in our routine.
![Smile](images/smilies/smile.gif)