There is no regulation on this. Whether it's appropriate or not depends on yourself. Fitness is practiced by one person most of the time. In order to avoid boredom, you can listen to some music to kill time and distract your attention. Don't focus too much on physical fatigue and extend the fitness time. It will be good to some extent, especially suitable for running. As for what kind of music to choose, it depends on your own preferences. Light music is ok, so is heavy metal music. However, if the fitness environment is very noisy, or the music played in the gym is loud, it is not suitable for individuals to listen to music again, because the external environment is too noisy, you will naturally turn up the music player loudly, which will unconsciously cause great harm to your hearing. I hope I can help you.