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Have you thought about joining a running club? I always run by myself but I am considering joining one locally myself. Most usually have websites which have their training days etc. listed.
I tried asking on my local Gumtree if anyone fancied some marathon training with me, half expected a few less than serious replies but got none at all
I tried a few sessions with a local club but they were too fast for me and although they were very nice I was a bit embarassed by it (I'm not that slow, 45min for 10k, but compared to them I was)
I suggested to Parkrun they should have a club or a way of meeting other Parkrun runners (bound to find some at my level) but they told me to join a local club so I'm still running solo