| well, starting off when you haven't been lifting at all...you're bound to get sore unless you're really careful and only do one set per body part the first week or two, and slowly ramp up to your program's desired sets over a few weeks.
and when you are brand new, you shouldn't necessarily lift the heaviest you can lift right away either. your muscle may be able to do it but your joints and ligaments may not quite be up to the challenge. but a few weeks of lifting will strengthen them up as well. | 
