In 'Journal,' the Bevel app on iPhone recorded that I didn't achieve 30 mins in zone three during a fast dog walk yesterday. I know I did, and it's recorded in 'Fitness' that I spent 33 minutes in zone 3 (and 15 in zone 4 - it was pretty brisk). It's only happened once, so I'm not worried, but it seemed a bit odd. I still like Bevel very much though. ❤