I took 3 days off to rest my back and I think I'm ok to continue on to week 2 of the program. It still bothers me a bit, but it's feeling much better than it was before. I had a soccer game on Tuesday night and it actually felt pretty good. I bought myself a neoprene back brace for exercising while my back is still bothering me and it seemed to help at soccer. So fingers crossed that it goes well tonight when I try core synergistics for the second time around!