But with the new app Posture Pal, all you need is something many of us already have—a pair of AirPods.

Just start the app and wear your AirPods. Thanks to built-in motion sensors in the headphones, the Posture Pal will work in the background to detect bad posture.

There are a number of ways the app can alert you. Along with visual alerts, you can select for your iPhone to vibrate or hear sounds when posture is poor.

The app also works while other sound is playing. So you can rock out or watch and still hear when your posture needs to improve.

Posture Pal is a free download now on the App Store. It’s for the iPhone.

You’ll need AirPods Pro, AirPods Max, third-generation AirPods, or Beats Fit Pro to use the app. It’s also compatible with other headphones that can send motion data to your iPhone.

A Posture Pal Pro tier can be unlocked with a $1.99 in-app purchase. With that you can take advantage of custom color and theming, custom sensitivity, and 12 different app icons to select from.