I think I am doing my abs wrong. I do 3 sets of crunches and 3 of backward crunches ( I follow what is in the BRx book.) I don't feel a burn even when I do 100 of the regular crunches. Last nite, I held them for 3 seconds each and I still didn't feel a burn. With the reverse ones, I put the bench on a slant, and I could only do 25, but this morning my lower back is sore so I think I did them wrong.
Any advice? I want to get the most out of my abs, but I need help!!
Thanks
Robin