Final answer:
High-intensity interval training (HIIT) is the type of aerobic activity that elevates your heart rate above your threshold of training and into your target zone for cardirespiratory endurance.
Step-by-step explanation:
Aerobic activity intense enough to elevate your heart rate above your threshold of training and into your target zone for cardirespiratory endurance is known as high-intensity interval training (HIIT). HIIT involves short bursts of intense exercise followed by periods of rest or lower-intensity exercise. This type of training helps to improve cardiovascular fitness by challenging the heart and lungs to work harder.
Learn more about aerobic activity