I did a quick search through the threads and the closest one was 2 years old with no good information. I usually do weighted decline situps and russian twists w/ 25lb plate once per week. I put it on my chin/chest and everything feels fine. When I put the plate behind my head my spine really hurts. I used to have a similar problem even with the weight on my chest when I first started lifting and the original problem was that my back muscles were not strong enough. A few weeks of deadlifts easily solved that problem, but now my concern is that since I havent heard of anyone else having back pain when they put the plate behind their head- is there a part of the back I am neglecting? Anyone had a similar experience or understand what I'm talking about?