to be clear, I meant working as in bearing load - of course your lower back will be active in stabilising your spine through the movement, as will your core. So

to be clear, I meant working as in bearing load - of course your lower back will be active in stabilising your spine through the movement, as will your core. So you're going to feel that, especially if you're keeping tight. But your lower back shouldn't be generating the force necessary to lift the weight.