What+is+Interval+Training?

Interval training is a type of physical training that involves bursts of high intensity work. This high intensity work is alternated with periods of rest or low activity (the intervals in interval training)

Anyone runner varing from an 100m Sprinter to an marathon running train all under the same type of interval training, just different distances are used.

As well, Intervals are not just used for runners, can be any sport, such as swimming, cycling etc...