What defines interval training in a fitness context?

Interval training in a fitness context is characterized by alternating periods of high-intensity exercise with periods of lower-intensity recovery or rest. This training method is designed to improve both aerobic and anaerobic fitness, allowing for higher overall intensity and calorie expenditure compared to steady-state exercises. By incorporating bursts of intense activity followed by recovery phases, interval training maximizes cardiovascular capacity, enhances metabolic rate, and can improve workout efficiency.

The nature of this training also lends itself to various formats, such as high-intensity interval training (HIIT) or tabata workouts, which have become popular due to their effectiveness and time efficiency. In essence, the structure of changing intensity levels is what fundamentally defines interval training and sets it apart from continuous, steady-state workouts or exercises that focus solely on strength.