I don't run marathons 
A marathon is 26 miles. That is way too long for me.  I would be lucky to run 26 feet.
Really?
The marathon  was o ne of the original Olympic events, started in 1896
Ok. Where was it?
The first one was Marathon to Athens  when a sldier ran to announce a victory.  He collaped and died at the end.
Really? I think that the reason it is called marathon 
I think that is true.  There are over 800 marathons run each year, now
800?
Yes, but many are recreational. Very large ones can have tens of thousands of participants.