Yeah I usually do a 5k, 10k or 13k if I just want that little bit of extra mileage. It's just one of the Parkrun's which I've heard aren't that competitive but I'd still like to be within the top 40% of runners. I achieved a new 5K PB at 21.something minutes the other day which is about 3 minutes more than my usual average. Haven't been able to do it since and I've no idea what I did differently apart from letting my mind wander instead of focussing on what my watch says. I'm not wanting a new PB at the run nor is there ANY way I'll be breaking the fastest female runner record of 19:18! I just want to run the best I can without feeling completely drained and angry at myself afterwards for not doing as well as I know I could have.
I do tend to have half a banana an hour before I run and I make sure I'm always hydrated but I'm not too clued up on nutrition.