[Fairview]

. . .an immense amount of walking ~ a mile or two a day . . .

A mile or two a day isn't exactly "an immense amount of walking." It's trivial, actually. Now, if you walked four or five miles a day, that would be reasonable for someone who was trying seriously to deal with a health problem through exercise, and even that isn't "immense."

My dogs inform me that I have no choice but to walk at least four miles a day. Sun, rain, moon, snow, whatever, we are going out in it.

[muawiyah]

For the average urban dweller one mile is an immense amount of walking (and you must remember I'm talking about walking over and above any other exercise).

For many end stage diabetics, walking is, of course, not possible.