Experts recommend an hour of physical activity a day. For most Americans, that is a dream. We spent $4.9 billions on fitness equipment and $17.4 billion on fitness clubs in 2006, but according to the American Time Use Survey, 83% of us don't exercise at all on a given day. Workout is another one of those things we know we should do, but just don't do it (or do enough of it), reflecting the gap between hard-weired (body) apparatus and the logical reasoning.
Source: Time (Nov. 26, 2007)