4. If you are working at a target heart rate of 133 bpm, what would be the target heart rate zone? (This should be expressed as a % of max HR)?

You can estimate your maximum heart rate based on your age. To estimate your maximum age-related heart rate, subtract your age from 220. For example, for a 50-year-old person, the estimated maximum age-related heart rate would be calculated as 220 – 50 years = 170 beats per minute (bpm).

Explanation:

answer; i believe the answer is moderate level;