Are you supposed to feel this exercise at all in the lower back? I know that "as you get stronger you'll use your arms less and less". Well, I'm not "stronger" yet and my arms are usually wrecked by this stage of the routine.
I also don't have enough endurance to make it all the way down to the floor to then walk all the way back up, so I end up using legs and arms to keep balance to even just finish the total reps. Is that acceptable, too?