When starting out they over do it. People come in and try to make up for the last 15 years of sitting on the couch in one day. They lift too much and they hurt themselves. Anybody that has had a bad case of DOMS knows how much it hurts and a newbie suffering from DOMS just put themselves out of the game for at least a week if not forever. So go easy, lift a little not your max. Glide into coming to the gym. Most importantly come back and workout tomorrow, it's all about consistency. It's a marathon not the 50yd dash.