High-Intensity Interval Training (HIIT)

Definition

High-Intensity Interval Training, or HIIT, is a form of cardiovascular exercise that consists of short bursts of intense activity followed by periods of rest or low-intensity exercise.

Scientific / Technical Definition

High-Intensity Interval Training (HIIT) is a cardiovascular exercise strategy that alternates short periods of intense anaerobic exercise with less intense recovery periods, aiming to improve cardiovascular fitness and muscle endurance. These intervals can be repeated for a total of 15–30 minutes, making HIIT a time-efficient workout method.

Benefits

• Improves cardiovascular health
• Boosts metabolism
• Enhances fat loss
• Increases muscle endurance
• Improves insulin sensitivity

Examples

• Sprint intervals on a track
• Circuit training with bodyweight exercises
• Interval cycling classes
• Jump rope intervals

Additional Information

• sideEffects: Potential side effects of HIIT include increased risk of injury if not performed with correct form, and excessive fatigue if adequate rest periods are not observed.

Related Terms

• Tabata
• Aerobic Exercise
• Interval Training
• Anaerobic Exercise

References

• The Science of High-Intensity Interval Training
• Metabolic Effects of High-Intensity Interval Training