With athletes/in the context of sports you almost always use "laufen" for "to run". Take a look at this: https://german.stackexchange.com/questions/18395/is-there-any-difference-between-laufen-and-rennen
I think what Christian means is that it doesn't really make sense to say "Wir rennen ein Paar Meter" because it's actually fairly difficult to run six feet. Leap, jump, start running: yes. But six feet is hardly enough time to get into an actual run. Möglich, aber unwahrscheinlich.
ein paar = a few, a couple (= a small number of)
ein Paar = a pair (= exactly two that belong together)
why was i marked wrong for saying a few?
Because the list of accepted sentences does not currently contain a version with "a few meters".
It probably should.
Perhaps if enough people report it, it will be added (back?).
The phrases 'a few' and 'a couple' are more or less interchangeable in English. (I generally think of a few as being a bit more that a couple but that's probably just me.) As the MOD pointed out, if you want to say 'a pair' then you'd use 'ein Paar' with a capital P. But you'd never say 'a pair of meters' in English nor, presumably, 'ein Paar meter' in German, rather 'two meters' or 'zwei Meter'. So, to my mind, both "We are running a couple of meters," and "We are running a few meters," are correct translations, but "We are running a pair of meters," is not.
for me a couple always means two, some people use it to mean "a few". I would always say a few but I am a bit of a pedant from the extreme north i.e North East of England . Never could understand why Yorkshire was call the north. When I was a boy York was half way to London.
Dahlie5 and Andrew662949, were correct when writing a year and six months ago that "meter" is used in U.S. English (und Deutch), but "metre" in the rest of the English-speaking world. Die Eule uses the U.S./American dialect.
And, yes, "meters" refers to length in this context and not to a measuring device for electricity, gas, or liquid. (NB: for such devices, "meter" is used in all English dialects.)