Interval training is a type of discontinuous physical training that involves a series of low- to high-intensity Exercise workouts interspersed with rest or relief periods. The High Intensity (HIIT) periods are typically at or close to Anaerobic Exercise, while the recovery periods involve activity of lower intensity... Interval training can refer to the organization of any Cardiovascular workout (e.g., cycling, running, rowing). It is prominent in training routines for many sports, but is particularly employed by runners. http://en.wikipedia.org/wiki/Interval_training aka WindSprints, WalkBackSprinting
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