Pain

I started my core strength routine yesterday after I had a forced break of about 3 months (just didn't have the time due to project work). The reason why I do core strength is basically to strengthen my back to avoid further problems with spinal discs. But now I am in hellish PAIN. My muscles are so sore, that I can't really move. Pure pain from literally head (in particular neck) to toe (calves). Think I'm gonna spend the afternoon reading. Would someone please hold the book for me?