What does interval training primarily involve?

Interval training primarily involves alternating periods of high and low intensity exercise. This method is designed to improve both aerobic and anaerobic fitness by combining bursts of intense activity with recovery phases. For example, a typical interval training session might include sprinting for a set distance or duration followed by walking or jogging for a specific recovery period.

This approach effectively challenges the cardiovascular system and enhances endurance, as the body adapts to varying levels of exertion. It also allows individuals to push their limits and achieve greater fitness levels while helping to prevent boredom in workout routines. The strategic alternation of intensity also aids in the effective use of energy sources in the body and can lead to improved performance in various sports and physical activities.

The other options do not capture the essence of interval training; constant high intensity would not incorporate recovery, solely low intensity workouts would not take advantage of the benefits of higher intensity efforts, and stretching and flexibility training focus on range of motion rather than intensity variations.