Final answer:
The maximum heart rate (HRmax) can be calculated as 220 minus the individual's age.
Step-by-step explanation:
The correct answer is A) HRmax is 220 minus your age.
To calculate the maximum heart rate (HRmax) as a percentage, you can use the formula 220 - age. For example, if someone is 30 years old, their maximum heart rate would be 220 - 30 = 190 bpm.
Keep in mind that this is an estimation and individual variations can occur.