With all my heart

So, heart beat at rest = 60bpm.
Easy just take it in the morning when you wake up.

Maximum heart rate, a little more effort required.
They quote a formula where you take you age from a number, or where you take a percentage of your age from a different number, or you can do it by running.

Good run ending in a sprint (well a rapid jog) up a very steep long hill (well a small incline).

Calculation method, 182bpm.
Running method, 195bpm.

Really enjoyed the run.
But what does all this stuff mean?
How does it help?

3.75miles
34mins
9.06min/m
164bpm