Maximal heart rate is estimated by subtracting your age from:

The formula for estimating maximal heart rate is based on a commonly used calculation: 220 minus the person's age. This means that as a person ages, their maximal heart rate decreases. The number 220 serves as a baseline estimate for the highest heart rate a person can achieve, which is why it is used in this formula.

For example, if someone is 30 years old, their estimated maximal heart rate would be calculated as 220 - 30, resulting in an estimated maximal heart rate of 190 beats per minute. This estimation is crucial for determining training intensities and setting appropriate exercise thresholds.

The alternative choices reflect numbers that do not align with established guidelines for calculating maximal heart rate. While each of those numbers can have relevance in different health and fitness contexts, they are not utilized in the standard maximal heart rate estimation formula. Thus, using 220 as part of the calculation provides the most recognized and widely accepted estimate for maximal heart rate in fitness assessments.