Back to music again, and we can see that just like silence doesn't help us to be more creative or better drivers, it's not much use when we're exercising, either.
Research on the effects of music during exercise has been done for years. In 1911, an American researcher, Leonard Ayres, found that cyclists pedaled faster while listening to music than they did in silence.
This happens because listening to music can drown out our brain's cries of fatigue. As our body realizes we're tired and wants to stop exercising, it sends signals to the brain to stop for a break. Listening to music competes for our brain's attention, and can help us to override those signals of fatigue, though this is mostly beneficial for low- and moderate-intensity exercise. During high-intensity exercise, music isn't as powerful at pulling our brain's attention away from the pain of the workout.
Not only can we push through the pain to exercise longer and harder when we listen to music, but it can actually help us to use our energy more efficiently. A 2012 study showed that cyclists who listened to music required 7% less oxygen to do the same work as those who cycled in silence.
Some recent research has shown that there's a ceiling effect on music at around 145 bpm, where anything higher doesn't seem to add much motivation, so keep that in mind when choosing your workout playlist. Here is how this breaks down for different genres: