that challenge is almost always a concentration/endurance one, like "keep your hands really steady". We've had a couple of those challenges so far, and neither Erik or Eddie have done well. Eddie even quit one of them for donuts after 15 seconds even though he knew it was him or Reynold going home that night.
Eddie/Erik need to hope for an obstacle course type challenge that would play to their strengths. But frankly I'd be disappointed if either won. Eddie is a likeable doofus who hasn't played the game at all. Erik I'd probably be OK with - he hasn't played a bad game - he was on the wrong side of the first vote, worked himself back into the alliance, made himself the swing vote a couple of times. But he hasn't played a good game either. When he got the swing vote he was always "This is scary. I'm going to make up my mind at the last second" On the scale of winners he'd be down with Fabio