I think you are talking about your legs being sore. The dead lift works the legs and the lower back that is what I was talking about developing a stable base or core. Your legs are sore because you admittedly do not work legs so you will feel it more in the legs than the lower back you probably are really feeling it along the hamstrings, am I correct? You need to be careful with this especially since you are new to it, think about buying a belt and use it. And S_T_R_E_T_C_H_! Before and most important afterward.