In episode #311 of The Simpsons, Homer gets his license suspended, and finally manages to make it to his neighborhood bar, which turns out to be just a few yards down the street from his house, but before he goes in, he stops and says, "From now on walking is my beer, and feeling good is my hang-over." (After he falls in love with walking and does a song-and-dance routine about it, his wife Marge runs him over.)

Figure 3 here shows how the precipitous decline in walking by Americans since the 1940's. No wonder we're fat.