Hi , I recently bought some new shoes
Previously I ran in NB 730 which are neutral and lightwieght
I replaced them with NB 764's because I needed more cushioning and a little more support
I have run about 20 miles in them so far , but last run I experienced lower back pain
So for SLowboy or Annajo or any other medical / shoe experts out there
HELP
I'm hoping its just down to bad posture at work BTW
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20 miles-it would be a bit soon for any problem with the trainers to manifest itself, but not impossible. but like you say, it might be unrelated to the trainers.