By Dr. Jack Daniels
There are really only two types of training a person can do: steady running and intermittent running. By steady running I mean a non-stop run at a consistent intensity. The intensity may be very easy, as at the beginning of a warm-up, during cool-downs or during recovery runs; or it may be moderate, as when running at Marathon pace or Threshold pace. Any intensity faster than threshold pace will usually be associated with intermittent running, as during Interval or Repetition workouts, types of training that stress the aerobic system or that work on mechanics, speed and economy.