There is a prevalent belief these days that kids can't concentrate. Terms like ADDHD, and distractible get kicked around like a death knell on this next generation.
It's simply not true. Give them a task (or any activity) they value and they are all about it.
We tried to give the kids some downtime - volleyball, frisbee,etc... It lasted all of fifteen minutes before they were back at their pads with mallets/sticks in hand. They are all about the task at hand.
Talk about life lessons - Indoor Percussion is full of them!