What to lift with at the begginning of a Deadlift

[BearMode]

After I setup my deadlift, do I start the lift with only my legs and then throw in my back when I get the bar up to my knees? That's what it seems like Rippetoe was trying to say in SS because I believe from experience that trying to start with your back is what rounds it, is this true? Or should I just start lifting with my entire body. Currently my deadlift is lower than my squat so I'm trying to figure it out.

[Tom Campitelli]

Push the ground away with your feet while keeping your chest up and the bar in contact with your legs.

[jillingworth]

Everything goes at once. Nothing individual leads off. As Tom said, keep the bar close and push the ground away from the weight. Don't jerk the bar up.