Torso Rotation.

Rotation, without the lower back paying the bill.

You rotate in everything from a golf swing to carrying something around a corner, but almost nobody trains that movement with resistance. Here the path is guided and the hips locked, so the twist comes from the obliques and not from the vertebrae of the lower back. An 80 kg stack in 5 kg steps gives you real progression on an exercise people otherwise do with a stick across the shoulders. Rotation is a strength exercise. Treat it like one.