Not only does a great playlist make working out a lot more fun, but it also helps the time go by.

When crafting a playlist, it’s tempting to just throw all your favorite songs together. But believe it or not, there is a science behind what makes a great gym playlist — and how music can impact your body more generally.

“Music is able to increase stimulation, as there’s a connection between auditory neurons and motor neurons. That’s why music often makes us more mobile and motivates our body to move,” explained Making Music Mag.

In a 2008 study from Costas Karageorghis, an associate professor of sport psychology at Brunel University in England, found that songs tempos should be between 120 and 140 beats per minute — which is also, roughly, the average person’s heart rate while working out.

Here are a few playlist suggestions from certified personal trainers around the country:

“Music gets my mind off of what I’m doing in the gym,” Chaniece Tarpley, a certified personal trainer, nutritionist and on-line coach, told The Atlanta Journal-Constitution. Here are Chaniece’s must have songs:

  • “Wish” by Kehlani
  • “Notice Me” by SZA
  • “Tomorrow 2″ by Glorilla and Cari B
  • “Ass Like That” by Victoria Monet
  • “Players” by Coi Leray

“Lyrics are important,” said Joy Dossman, a certified personal trainer. “Subliminally, we are feeding our minds, whether we’re aware of it or not. So I play clean music.” Keeping it clean, here are Joy’s must haves:

  • “Communion” by Mike Teezy
  • “Sleepin!” by Nobigdyl
  • “Joyful Noise” by Flame
  • “For the Father” by Young Bro

“Music is the whole heartbeat of a workout!” Jules Gomez, personal trainer, nutrition coach, and fitness director at Sanctuary Fitness LA, told The Atlanta Journal-Constitution. “It also keeps you distracted form the voice in your head that tells you to quit.”

Here are Jules’s favorite motivational songs:

  • “Sweetest Pie” by Megan Thee Stallion and Dua Lipa
  • “Super Freaky Girl” by Nicki Minaj
  • “Yo Perro Sola” by Bad Bunny
  • “Do It Do It” (Tiesto Remix) b ACRAZE, Tiesto and Cherish
  • “Level Up” by Ciara

Popular music app like Apple, Spotify and Pandora have great workout playlists for those who don’t have the time — or interest — to create a personal playlist.

Spotify’s Beat Mode playlist has more than nine hours of music dedicated to keep you working out.