I started in on a version of the Intermediate Circuit workout today, and all I have to say is "OUCH!" I can barely walk, can't lift my arms higher than my chest, and my back feels like I've been run over by a truck (that backed over me just so it could run over me again) and my left knee is none too pleased with the full body squats with overhead presses that I wrapped each circuit up with.
I don't know about Delayed Onset Muscle Soreness...if I'm this bad now, I hate to think what I'll be like in 24 hours.