crunches and my back?
As of recently I have been working out my abs by doing crunches about 10 minutes a day. However, what I am noticing is that after about 4 minutes of doing them my back starts to hurt. I usually just power through the pain but there is always something back in my head telling me that I am permanently hurting my back. Should I just continue to power through the back pain (muscle pain not bone pain)? or should I stop?