Okay so I've been having problems getting my lower back to straighten out when pulling rows from the floor. So today, I used a rack, and put the bar on the lowest hole, about a foot or so off the ground. I was able to straighten my back a lot more. I just exploded up and let the bar down slowly. I want to do this for a couple weeks, then maybe try the floor again. Is this a good idea or should I be trying soon to go from the floor again, or does it really matter? thanks.