It's important to remember that the so-called max heart rate is simply "how fast can it go". It is not some kind of Do Not Exceed value. If you find your heart rate above the calcualted max value it simply means that the calculated max value is wrong for you.
My theoretical max is 174, yet I have tested it to 198, and regularly run with it over 170. I did a 10k on Sunday where the average was 171 (and I wasn't pushing it hard).
Somewhere on this site you will find how to test your max heart rate - give it a go, but be prepared to feel sick at the end!
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This one comes up a lot - plenty of people are nowhere near their theoretical max. Don't worry!
My theoretical max is 174, yet I have tested it to 198, and regularly run with it over 170. I did a 10k on Sunday where the average was 171 (and I wasn't pushing it hard).
Somewhere on this site you will find how to test your max heart rate - give it a go, but be prepared to feel sick at the end!