I consider James Polk to be the hardest-working president, perhaps of all time. When he entered office, he had 4 clearly defined goals he hoped to achieve: acquisition of the Oregon territory, re-establish the Treasury System, annex California from Mexico, and reduce tariffs. He achieved them all in just 4 years through long, hard work with little room for pleasure.Extremely rare for a president to fulfill his goals in 8 years let alone 4. That's the kind of president we need nowadays, not that laid-back, exercise-freak George Bush.