Go to this site: http://www.angelfire.com/folk/blountsux/
Excerpt with picture above:
"When you are a 7-foot center with a big contract there is no need to do anything. If a little punk is coming down the lane, let him go, as you may catch something off him if there is contact. As illustrated in the picture, do not put your hands up, keep them low so the opponent can score."