Most fitness apps are garbage. Nearly all the people I know who use Apple watches, FitBits, or other worthless gadgets and toys don’t need them and don’t make any change based on the feedback they get. They just like being cool and having a thing pat them on the back (I am guessing this betrays a deeper emotional vacuity, but that’s another story). The people I know who are truly dedicated to their physical training expend more energy on the training. Who do you think gets more from their strategy?

The 10,000 steps per day metric is a fiction…based on nothing of value. And absolutely no one has any evidence that if you take 10,000 steps daily (about 4.5 miles of walking for me) that it’s better or worse in terms of morbidity, mortality, or quality of life than other forms of physical work, such as kettlebell or sandbag training.

Just go do some work. Do it frequently. Have good technique. Give yourself rest days (those are the days to do 4 to 5 miles of walking). Eat with your brain turned on. Really, that’s about all you can do. It’ll be enough. I promise.

However, Dr Greg Hager, an expert in computer science at Johns Hopkins University, said many apps and devices had no real evidence base and that a one-size-fits-all approach could be harmful for some people.

The Telegraph: The 10,000 steps a day myth: how fitness apps can do more harm than good.