In general, the exercise guidelines set out by the American College of Sports Medicine give you a place to start when figuring out how often to workout. 1  For cardio: Depending on your goal, guidelines recommend moderate exercise five or more days a week or intense cardio three days a week to improve your health.
This Day In History: 04/04/1968 - Dr. King is Assassinated. Many historical events occurred on April 4th, and Russ Mitchell recaps them in this video clip from This Day In History. President William Henry Harrison became the first US President to die while in office when his cold turned into pneumonia.
Martin Luther King Jr. America honors civil rights leader Dr. Martin Luther King Jr. every January at the time of his birthday. This collection of photos takes a look at the legacy of the famed civil rights leader and Nobel Peace Prize winner, who was assassinated on April 4, 1968 in Memphis, Tennessee by James Earl Ray.