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I'm sat on the sofa feeling very frustrated after attempting 6 x 800m reps as part of my Brighton marathon training, but only managing 2 reps due to lower back pain.
I'm a social runner and have been running 25+ plus miles a week prior to starting the FIRST marathon training plan 3 weeks ago. Everything has been going well and have been feeling confident about the Brighton marathon until the dreaded lower back pain hit me. It first got me on Tuesday evening while doing a 7 mile tempo run but managed to get round at the required pace. I've been out this evening to do my 800m reps and after mile or so I could feel the pain creeping up on me. Managed to do 2 reps and thought I'd be better off getting myself home and logging onto the Runners World forum than attempting the remaining 4 reps in pain. The pain is only there while running, it goes instantly when I walk/sit down etc.
I've had this pain before (around a year ago) but it disappeared after a 6 weeks or so. I can't afford to wait 6 weeks for the pain to go this time as it will severely impact on my marathon training.
Does anyone have ideas as to what the pain could be caused by and how I can reduce/get rid of it? I've read that it may be due to a weak core, if so what are the most effective exercises to build up the core associated with the lower back?
Any advice would be greatly appreciated.