With most abdominal excercises i tend to get a pain in my back. I've been looking all over for excercises that are hard on the abdomen but easy on the back.
But whenever i find some reference to an excercise that 'should' be easy on the back. It is very weird and awfull to perform.
What abdomen excersis could be better to perform. And even have the possibility to add some weight when strength is increasing.