National Academy of Sports Medicine (NASM) Group Fitness Instructor Practice Exam

What fitness component is targeted by a class that alternates between intense exercises and periods of rest?

1. Muscular strength

2. Flexibility

3. Cardiovascular fitness

4. Muscular endurance

The correct answer is: Cardiovascular fitness

The class that alternates between intense exercises and periods of rest primarily targets cardiovascular fitness. This type of training is commonly known as high-intensity interval training (HIIT), where short bursts of vigorous activity are followed by recovery periods. This approach increases heart rate significantly during the intense phases, which enhances the heart's ability to pump blood efficiently and improves the overall aerobic and anaerobic conditioning. By incorporating both high intensity and rest, participants can maximize their cardiovascular endurance and overall fitness level. This method also helps in increasing calorie burn during and after the workout, contributing to improved cardiovascular health and fitness outcomes. Other components like muscular strength and endurance may also be involved depending on the specific exercises chosen, but the primary focus of alternating intensity with rest underscores a significant emphasis on cardiovascular fitness.