Question

Which is true about the maximum heart rate? It's a higher rate than the target heart rate. It's difficult to actually test. It's calculated by subtracting your age from 220. all of the above

Answer 1

All of the above because all of the your answers are true.

Answer 2

Definitely all of the above. You shouldn't set it as your target the age thing is a decent guess and it is difficult to test because testing someone would mean pushing them to the max which is risky