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If you're having to ask, I'd say that's usually a sign.
Last night I couldn't walk, this morning I'm ok - hence wondering.
I'll try a sloooooow run out, I've got a route that I can run either 5 or 10 on, both loops, so will do that.
I noticed on my run yesterday that the 4th Km was the slowest, the 5th the fastest - guessing that's fatigue building and then the excitement of pushing to the finish?
I'd say slow 5k with some music. If you're having to ask, I'd say that's usually a sign.
Also, in response to your speed question, have you tried interval training?
I used to do it years ago before I got in to running, then I took up running, and stopped the treadmill interval training. Now I've combined them both in the last 3 months, and my speed and fitness is getting better and better.