I don't see where you get that idea, because it isn't what he said. What he said was "If you pass anybody, you are not walking slowly enough for it to be “tak

I don't see where you get that idea, because it isn't what he said. What he said was "If you pass anybody, you are not walking slowly enough for it to be “taking a walk.”" i.e. You can only be classed as "taking a walk", if you are the slowest person around, or if the only people slower than you are far enough away that you won't catch them up. This makes it extremely difficult to take a walk, particularly if you start anywhere near an old people's home, or a primary school, or an area of town where lost tourists peer down each side street in search of a landmark. Note that this is in the paragraph that declares "taking a walk" to be "not difficult". Taking a walk by my definition - walking at my body's natural pace, aiming for nowhere in particular - is easy. His definition makes it very difficult indeed.