Not so long ago, there were many more purpose-built portable electronic devices than there are today. You might have had a phone for calls and texting, an iPod for music, a digital camera for taking photos, a GPS device for navigation, a handheld game console for entertainment, and a separate e-reader for reading digital books. But then along came the era of smartphones and watches, and they quickly gobbled up the functions of all of those standalone devices.
This is a companion discussion topic for the original entry at https://www.edgeimpulse.com/blog/this-smartwatch-doesnt-let-you-skip-leg-day