Have you ever thought about the way you stand or checked to see how it may be affecting your running?
Think about it, if your upper body tends to lean backwards (against gravity) it may cause pressure on your lower back day to day, but as a runner it will mean you have to work extra hard as you'll need greater propulsion to move forward on flat terrain. Going up hills will be even harder!
I've worked with many runners who are totally unaware they are leaning backwards, they're convinced they're upright until you show them a photo of themselves and as we know a picture never lies.
So stand the way you normally do beside a mirror (to the side) and check the way your standing. If you're upper body is leaning back you will need to start teaching it to be upright. Come along to one of the listed chirunning workshops as the first part focuses on getting your alignment, balance and static stance correct.
So don't let the way your standing hold you back, make it work for your running.