5K, Kind of

I got in late from California last night, then had insomnia, so was very short on time when I headed out the door. Decided to run fast and short. I warmed up for one mile (11:11), then ran two fast miles, for me at least (9:16, 8:46), then jogged it in at about a 12:00 pace. Every speed uses different muscles, but the interesting thing is that my knee never made a peep. Possibly I have turned a corner on that issue, but it will take a few more times out there to confirm. Fingers are crossed here in Texas. I'm thinking that for me a realistic 5K time is about 25:30, but I have no idea if that is good or not in the old geezer class.