I supersetted RDL's with back squats today. When I did the RDL's, I felt NOTHING in my hamstrings, but had A LOT of lactic acid buildup in my lower back. The burning sensation was most likely exacerbated by supersetting the RDL's with squats, but nevertheless, is this normal to experience the vast majority of muscle stimulation in the lower back when doing RDL's? I am sure I have correct for with the RDL's, but what could I be doing wrong? Anyone else ever experience this?