If your only exercise is walking to the light switch you have bigger problems.
It's cumulative.
Turning off the lights is negligible to your overall health. Automating it (or not) will not affect your obesity or other health outcomes. There are lots of reasonable arguments against IoT switches; this is not one of them. Let's move on.
Assertions dressed as facts are not very useful either.
You mean like:
> the logical conclusion to that are the couch potatoes shown in the movie Wall-E
?
Just pumping the muscles in your legs will decrease the potential for blood clots forming in them, according to a recent HN topic.