Fitness trackers

Yes, I'm going to mull over fitness trackers. As many jobs become sedentary, and lifestyles do, the health service, at least in the UK, have become concerned that people are not getting enough exercise. Shortly after this, fitness trackers started popping up for sale.
I'm not against them, used properly.  They are meant to keep track of your activities throughout the day.  The people who bought them, who already kept themselves fit, in whatever way are not the focus of this post. That's because they were already keeping fit, and I believe that the more expensive fitness trackers record heart rate and periods of in activity, etc.
It's the cheaper ones that just count steps, and let the wearer know how many calories they have burned that I have a problem with. The cheaper ones tend to react to any motion of the arm, so if the wearer waved enthusiastically to attract the attention of someone, it would record activity and calories burned that weren't actually used.  Recently the researchers have found that fitness trackers can be inaccurate.  I could have told them that, and saved them the research money for something more important.
Here's my take on fitness trackers. You find that it's usually people who think that they should keep fit who buy them, and they are constantly watching how many steps they have done. Look.....just walk short distances instead of going in the car, don't have endless email conversations with work colleagues, go and discuss the subject with them if a single email doesn't sort the matter out. 
Using technology to track fitness isn't the answer, taking a break from technology is a saner answer.
Also, wearing a fitness tracker won't make you fit, actually doing some exercise, even if it's just walking will make you fitter.
By the way, I'm not completely against them. I have a friend who has angina, and she keeps herself fit by walking, cycling and dancing, plus her job is very physical.  Her fitness tracker keeps track of her heart rate and I believe that it has an alarm that she can set in case her heart is in danger of an angina attack, which I think is good use of the tracker.