42.195 kilometers is the standard distance that any marathon running track needs to be stretched out at. But this metric is only taken on a minimal basis and not on an exact configuration because of several reasons, the most important of them being the fact that these involve running on the road, and there is no designated running track on a sports field that can be designated or allotted for the length of track required in marathons.
Of course there are half marathons as well, which you could opt to participate in, by running a distance of 21.0975 kilometers, but this is something that you can find only in certain cities, states or countries. The popularity of the conventional marathon races are way higher.
Just so you know, the most popular cities of the world where half marathon racing events have been organized in the past include Prague, Philadelphia, Hague, Lisbon, Valencia, Udine, Lille, Rotterdam, Berlin and New Delhi, to name a few.
Did you know that the nomenclature of ‘marathon’ actually was derived from the ‘Battle of Marathon’ which was fought between the Athenians and the Persians? Yes indeed, this was a catastrophic fight that took place all the way back in 490 BC, and as you might have guessed, it was definitely the Greeks who won the Battle of Marathon, and drew the Persians out of their land
What was the juiciest bit about the victory was that the Persians outnumbered the Greeks way, way higher, and yet it was these spirited Mediterranean fighters who managed to drive out the technically superior Persian forces, by sheer bravado and tactical skills. This is how the nomenclature of marathons came into being, tracing all the way back to the ancient Greek civilization, as they defeated the mighty Persians by funneling their attacks, wave after wave and did not let their numbers deter their bravado. On the whole, it was a marathon victory for them as they stood up with all might and bravery over a consistent period of time. Had they been rejoicing after the initial victory, the Persians would have eventually crushed them in their state of delirium and complacence, and they would never have been immortalized as the nomenclature-givers of marathon, where slow, steady and consistent running with stamina, yields results.