Which of the following percentages of maximum heart rate is classified as intermediate intensity?

Intermediate intensity exercise is generally defined as any activity that raises the heart rate to a specific percentage of an individual's maximum heart rate. This range typically falls between 60% to 80% of maximum heart rate. In this context, the percentage that is commonly recognized as falling in the intermediate intensity range is around 70%.

Exercising at 70% of maximum heart rate allows individuals to engage in a moderate challenge that improves cardiovascular fitness while still being manageable for most individuals. It balances intensity with the ability to maintain the activity for an extended period, which is ideal for building endurance and overall fitness without being overly strenuous.

Lower percentages, such as 60% and 65%, are generally classified as light to moderate intensity, and anything above 70% may start to push into the vigorous intensity category. Therefore, 70% is identified as the standard threshold for intermediate intensity, making it the correct choice in this scenario.