maybe it's because I'm not much of a fan, so I don't feel any impact, but Namie has the best songs for running and working out.
I don't really like BALLERINA though... it's a hot mess in terms of arrangement, like all over the place.. surprisingly worse than Ayu's Tell All
it's just one of those songs (she has many of those) where I would never listen fully on a bus/train trip but the beat is way too hot so you can blindly listen to it and run or work out. that's one thing I appreciate a lot about her songs - you don't have to think much or feel anything... you just feel the beat and think "wow hot song!"