Which term describes the varying intensity levels in interval training?

The term that describes the varying intensity levels in interval training is variable intensity training. This type of training involves alternating periods of high intensity and lower intensity, allowing individuals to push their limits during the high-intensity phases while also recovering during the lower-intensity segments. This structure is beneficial for improving overall fitness, increasing cardiovascular endurance, and enhancing metabolic rate.

Variable intensity training is particularly effective because it can target different energy systems, maximize workout efficiency, and improve performance over time. By manipulating intensity throughout the workout, it keeps the body challenged and engaged, which can lead to greater adaptations compared to steady-state exercise.

In contrast, constant training would imply maintaining the same intensity throughout an exercise session, which doesn't align with the concept of interval training. Circuit training focuses more on performing a series of exercises in succession with minimal rest but does not inherently involve varying intensity levels. Progressive training typically refers to gradually increasing the demands of workouts over time, such as incrementally adding weight or duration, rather than varying intensity within the same session.