1) Gaps 1) Intermissions 2) Times between acts 
Three- minutes long rest periods between chukkas. Half time is five minutes.
speed workouts, usually run on a track, with distances and target paces decided before you run. They typically consist of relatively short sprints of 220 yards to 1 mile interspersed with rest periods of slower running.
a structured method of training that alternates brief, hard efforts with short periods of easier riding for partial recovery, similar to fartlek.
Type of workout where a set distance is run repeatedly with a recovery jog between; for example 6 times 400 meters with 100 meters recovery jog
Training in which short, fast "repeats" or "repetitions" often 200 to 800 meters, are alternated with slow "intervals" of jogging for recovery; usually based on a rigid format such as "six times 400 meters fast [these are the repeats] with 400-meter recovery jogs [the intervals]," interval training builds speed and endurance.
a structured method of training that alternates brief, hard efforts with short periods of easier riding for partial recovery.
In training, efforts over set durations designed to train one component of fitness. Usually done in groups with set rest periods; e.g. 2x20 would be two 20-minute intervals.