If I'm in the pool for 30 minutes, then sure it is interesting enough, but after that it gets boring. Swimming a mile or more is a chore simply because it gets

If I'm in the pool for 30 minutes, then sure it is interesting enough, but after that it gets boring. Swimming a mile or more is a chore simply because it gets boring. I would absolutely love a cheap(ish) and reliable mp3player to swim with.