Apple - What prompts breathe reminders on an Apple Watch?

By default, breathe reminders are set to display every 5 hours. According to Apple, you can adjust or disable the reminders by doing the following.

  1. Open the Apple Watch app on your iPhone and tap the My Watch tab.
  2. Tap Breathe > Breathe Reminders.
  3. Choose how often you get reminders.

It seems like the reminders to breathe are connected to actual respiration measurements. Every time I get the alert I become aware that I had been holding my breathe. .. Or maybe just I hold my breathe a lot and only become cognizant, when my alert goes off.