Thanks guys. My runners are only cheapies from target, but they're comfy and they fit well.
The thing is, as soon as my heart rate comes down and i'm finished, the pain is gone, its only present during the really intense parts. And its not an 'ow, i've hurt something' back pain, it is that throbbing period like pain.
Saying goodbye to calorie counting AND scales for a while.
Just enjoying the new and improved healthy me and embracing my new lifestyle!