This may seem silly that I'm asking this, but how do you perform a proper deadlift? I've googled it and went to a half-dozen different sites, and they all say something slightly different. I plan on doing this on a machine that has safety catches a few inches off the floor.

One site says that you start from a squat with your arms inside your legs. Another, arms outside your legs. Another says you pull up with your shoulders. Another, you pull up with your back. One says a deadlift should be a full-body workout that really taxes your central nervous system. Another says it's more of an upper-body workout.

I also came across rack pulls from these articles, which seem very similar except there's no leg movement. Should I do rack pulls and deadlifts in the same workout session? Or rotate them every 2-3 days?