The Apple Watch has a "Breathe" app which by default tells you to spend a minute deep breathing twice a day for relaxation/de-stressing. It times this randomly

The Apple Watch has a "Breathe" app which by default tells you to spend a minute deep breathing twice a day for relaxation/de-stressing. It times this randomly (often inconveniently) and it isn't really connected to what you're doing beyond, I believe, knowing not to do it during the middle of a workout, and it's very easy to turn off. I'm going to give the OP the benefit of the doubt and assume describing that as "the companies in California are even telling you when to breathe now!" is facetiousness.