I have got my kids into running (8 and 11 ). It's very gentle jogging, following the Get Running app. They love it but it means I have to run by them holding the music!!! I can't find a kids sized armband anywhere. They both have old non working iPhones that hold their music collections and this must be a big market especially with the current focus on health/obesity/Olympics. Any help on where I can find small sized armbands welcomed. Or other suggestions besides armbands?