Having trouble translating this: 多是不跑步的替跑步的操心
Not quite; I break this fragment like this:


多是
不跑步的
替...操心
跑步的


The word "多是" is a bit tricky too, as in this case it's an abbreviation of "大多是", or "mostly is".

So altogether, it should be:


  , mostly is those who don't run worrying on behalf of those who run.


Of course, this direct translation is awkward, so it might be better to rephrase it according to the preceding fragments. Here's my crude attempt:


  What's most laughable about all this hullabaloo, is that it is mostly coming from non-runners worrying about runners on their behalf.