This is why Japan's education system is so great. Osaka elementary schools to require Nintendo DS for every student
Well at least DDR's harder levels can make you sweat, and at you have no idea how popular it is at my Middle School, especially when it was introduced. Does the DS have to have "Brain Age" in it at all times or something? At least it's educational and makes you think, plus was highly popular in Japan, even spawning a sequel.
I think it's a great idea if they're using more challenging stuff then Brain Age. They don't have to worry about kids using them for noneducational purposes either if they use software similar to that of what they use to monitor computers in some schools.