I climb about twice a month with a neighbor that ran in college (he's 42). I talked him into going to the track with me last night (I'm 32), as his wife volunteered to babysit my kid while my wife is out of town. The plan was to do 2/4/2/4 at about 80% effort with 2 minutes jog between each rep. It's tough to plan pace times with the wind/cold this time of year in the mountains, so I go by effort. So, he basically kicked my butt. He ran 28/58/28/56. Needless to say, I was shocked. He's really gym fit, and a super strong climber. I just couldn't believe that would translate over to such good running fitness. So, after all this rambling, what would be a good 800 for someone his age? I'm 100% positive that he could run 2.05 right now with no real running training.