@zondaar39 I'm a bit confused here, so I may not be expressing myself very well. I want to get a good handle on the difference between specific fitness and general fitness.
On the one hand, I mainly do bwf "because I need a strong core to be a fast, injury-free runner".
On the other folk on this thread are saying "don't worry if you can't do 2 minute planks, as it only reflects the amount of specific plank training that you do".
So, to take that idea to its logical conclusion, I should only do running training if I want to be a good runner and forget all the abs, glutes, hips, etc. stuff that I do. I'm sure that's not right, but I don't have a good feeling to decide where to draw the line. Help!