I have a co-worker who used to be a quasi-serious runner challenge me to a 400m race. He has been out of competition 8 years AFAIK and I think his lifetime PR in the 5k is 16:??. I found a bunch of old 3k results in 9:40-9:50, some 1:19+ half marathons, a bunch of 17:xx 5k and the best one was probably a 35:29 10k. He ran track and XC in high school and college (Division 3). He was not a sprint specialist, so 400m is not his event.
I do marathons and halfs with recent PRs of 2:50/1:19. My most recent open race result is 3.5miles in 20:16 from June. I am probably at least that fast right now.
Should I be worried? I told him it would probably be close even if he was at his best (he doesn't think so). He seems awfully confident. Should I do anything specific to be prepared? I've never done a 400 before or any race on a track. I was planning to do a few time trials between now and the race, but wasn't going to put much effort into training for this. This thing is going down next Friday.