Which of the following is NOT a component of health-related fitness?

High-intensity interval training (HIIT) refers to a specific workout methodology that alternates periods of intense exercise with rest or low-intensity periods. While HIIT can indeed enhance various components of fitness, such as cardiovascular endurance, muscular strength, and even flexibility when appropriately included in a program, it is not itself a distinct component of health-related fitness.

Health-related fitness components typically encompass cardiovascular endurance, muscular strength, muscular endurance, flexibility, and body composition. These components focus on the overall health and physical capabilities of an individual, whereas HIIT is a structured training technique that can improve these components but does not represent a foundational aspect of fitness itself.

The other choices—cardiovascular endurance, muscular strength, and flexibility—are all established components that contribute to an individual's overall health and physical performance. Understanding these distinctions can help in designing effective fitness programs tailored to individual goals and needs.