Huh?
Huh?
You pretty much have to do some of both to get down there. Once you're down there and have your grip, then your shins come in contact and you pull your back into extension. I guess if you had to choose, there's probably more hip flexion than lumbar flexion, but they're both moving to get you there.
just bend over and grab the damn bar. then set your back. simple.
Some folks will mess up step 3 (bring the shins to the bar) by ONLY flexing at the ankles, instead of both the ankles and the knees. This error will not only results in a more horizontal back angle, but it will also put your weight on your toes and your shoulders well in front of the bar. Let's see a video to be sure.