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So went out this morning for a long run, and obviously it was pretty darn cold! About an hour into it I started to get slight pains in my sides (both sides, but not always at same time). They had felt a bit sore from the start, but thought it was just me getting into the run as had had a drink of water only 30 mins before (I usually wait an hour or so) Almost stitch like, but not quite. Thought maybe it was due to breathing in the cold air? I didn't need to adjust my pace and just focused on my breathing, and after a few miles it seemed a bit better. So is this because of the cold!? Any tips!? Thanks!