system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How do beats per minute or the tempo of music affect your workout.

I have noticed that there are some pop songs that have a really fast beat and my heart rate increases first because of the music and when I am walking or working out to it I suddenly feel more energetic and I can do higher intensity workouts easily.
gpt
It’s a mental thing.

Scientists aren’t even sure the exact reason we Like music, but we know it definitely impacts us, from starting to tap your foot to the beat to feeling emotional from the song. 

So a fast beat high energy song can definitely give you a sort of mental boost as your working out, as your brain wants to match the pace of the song.