Not expecting to find anything, I googled it up to see if there are any near our area. It was a pleasant surprise that there was such a class, and a new branch of Fly Kidz just opened last month in Kota Damansara, which was about 15 minutes away from where we lived. As an opening promotion, they had a free trial class.
I brought the boys for a trial class....and they enjoyed it. So, I've signed them up for the remainder of this term. They both have to be in different classes due to their ages. After the class, they were tired, and fell asleep in the car. They were also more subdued at home, and played together quietly for several hours (which is rare). I think their excess energy were beneficially used up during the class.