What don’t I accept? You’re reading too much into things. A lot of people don’t exercise enough. But countless millions of people stay at an acceptable weight without walking everywhere. Mostly it involves simply eating modest portions of balanced foods.
I am making a narrow, targeted argument in the context of a thread that has diverged into claims about the viability of bicycles as a primary means of transport, particularly for some sub populations. Fitting that question into a broad explanatory framework for widespread weight issues is outside the scope of that, and would only be a small part of such a framework in any case.
What don’t I accept? You’re reading too much into things. A lot of people don’t exercise enough. But countless millions of people stay at an acceptable weight without walking everywhere. Mostly it involves simply eating modest portions of balanced foods.
Exercise only account for a small portion of our time. The rest is spent on doing daily living. Time spent outside exercise are going to matter more.
Having an environment that encourages walking and biking keeps the population healthier than an environment that encourages sedentary behaviors.
The elderly especially need physical load bearing activities of some kind, or otherwise their bones are going to deteriorate to the point of hip fractures.
I wish people here would just accept that on average people don't exercise.