There may be some controversy about listening to music while you run, but when I’m alone, I almost always train with music. These headphones are Bluetooth and sync up with my Garmin 645 Music watch. They have a mini version, which I got because my head is small, and it’s not too bulky in the back.
Now for those of you who don’t run with music, I understand safety is a big concern. It’s a valid point, that you are less aware of your surroundings with music in your ears, especially for road runners. But these are different! They are bone conduction headphones which means they sit outside your ear so you can still be aware of what’s going on around you. They work and sound just as well as regular headphones, in my opinion, and it’s not like people passing by can hear what you’re listening to either.
Music can be considered a training hindrance for a few different reasons. For starters, it’s easier to tune out your performance and slack off on pace and form. Then sometimes you might find yourself actually running to the beat of whatever song is playing at the time, which may not coincide with your goal for your workout. But on those long, slow runs, sometimes the music helps the miles fly by.
I certainly don’t encourage listening to tunes while you’re racing, but as long as you’re smart about it, I think training with music is fine, and sometimes beneficial for the mental side of running. Just make sure it’s a help, and not a hindrance.