#3 Legs, Elbows, and Wrists
As you approach the bar to unrack it, dip down far enough with your legs so that you can rotate your elbows into a position where they are slightly in front of the bar when viewed from the side. Keep a tight grip on the bar so that your wrists remain neutral (and not bent backward at 90°).
At this point, simply stand the bar up with your legs. You unrack the bar using your legs, and nothing – nothing – from your waist up should change position after you unrack it.
If you have to adjust your elbow or wrist position after you unrack it, then you set up incorrectly before standing it up. Rack it, fix it, then unrack it again.