Despite the official change, many race directors still discourage use of headphones and personal music devices during races for safety reasons. If you're listening to music during a race, you may not be able to hear instructions from race officials and other runners on the course. One of the basic rules of racing etiquette is that you can hear others, so you can move out of the way or stop, when necessary.
The other warning about wearing headphones during a race is that you'll miss out on a lot of the race excitement. You won't be able to listen to bands, hear people cheering, or talk to other runners. There's also a chance that your music listening device could stop working during your race, so it's important that you don't get totally dependent on it.
If you need your music to stay motivated or beat boredom during the race, try using it on a low volume or with one earbud out, so you can still hear.
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