The main activity raises the heart rate above normal level for about how long?

The main activity raises the heart rate above normal level for about how long?

• A. 5 minutes
• B. 20 minutes
• C. 40 minutes
• D. 60 minutes

Answer: (B)

The main idea here is how long the central part of a training session keeps your heart rate above normal. During the main activity you’re working at a higher intensity, so the heart rate stays elevated for a sustained period to stimulate improvements in cardiovascular fitness. About 20 minutes is a typical duration because it’s long enough to overload the heart and lungs for gains, without causing excessive fatigue for a standard session. If you only exercise for a shorter time, like five minutes, the stimulus is usually too small to drive meaningful adaptations. Longer sessions (40–60 minutes) can be used for longer endurance programs, but 20 minutes is the common target for the main activity.

The main idea here is how long the central part of a training session keeps your heart rate above normal. During the main activity you’re working at a higher intensity, so the heart rate stays elevated for a sustained period to stimulate improvements in cardiovascular fitness. About 20 minutes is a typical duration because it’s long enough to overload the heart and lungs for gains, without causing excessive fatigue for a standard session. If you only exercise for a shorter time, like five minutes, the stimulus is usually too small to drive meaningful adaptations. Longer sessions (40–60 minutes) can be used for longer endurance programs, but 20 minutes is the common target for the main activity.