This is a gotcha that has bothered me numerous times.
In previous posts I believe the official answer from Nicholas was AG + AG, unless the character had the Hobby/Sport skill Running (depending on if you are using Harp or Harp SF). Now this is just from my personal memory - and I only remember this because of how many times it has burnt me in the past.
One of my players has actually taken to making sure all his more martial characters have at least one rank in this, just to avoid the somewhat difficult AG+AG check.
I hope this helps. I know that this question has come up numerous other times - but I can't find the thread and Nicholas' official answer right now.
Regards,