Now that that is all clear, we are going to detail the actual lift and what it goes on as we stand up with the barbell!
Now that we are clear, it should make this discussion a bit easier.
Getting back to the deadlift...the initial lift off the floor is caused by our hamstrings being strong enough to stabilize our pelvis so that the quads can do their jog; knee extension. This is where the "leg press" idea comes in. IF the hamstrings don't do their job, the quads will still do theirs, causing the famous, "stripper-pole-deadlift". NOT what we want!