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Lower back pain during a long run can be from your hamstrings getting fatigued causing you to slouch forward more causing stress there.
It could be poor form too, I had this problem. You need to keep your body standing high and tall you are running with your hips in front, pushing off with your legs. Picture it as a string is pulling you along by the hips, they need to be out there. Its kind of uncomfortable at first if your form ahs been bad this whole time. So instead of looking like a folded mattress while running, stand straight up and have proper leg/footwork
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