Definitions for "Interval training"
any training using alternating periods of very hard exercise and rest.
Specified distances of 2-5 minutes in duration run repeatedly with a specified period of rest separating each repeat. Usually the period of rest is equal to the period of the run. This is an aerobic workout.
Training made up of successive bouts of exercise at near maximal intensity alternated with periods of rest or lighter exercise such as brisk walking or slow jogging.