Alone - I can't keep up with anyone
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Yep, I'm usually at the back! When I'm running. Which thanks to injury I'm not at present, though I am still training just no high impact stuff.
When my mate was marathon training, I'd join her for the last few miles of her training runs. That way she got some company/distraction for the last bit of her run, & I got my own training run in too. Seemed to work for us both.
It took me ages to get the courage to run on my own outside, goodness knows why - seems daft now!