Having re-read my post, it may sound a bit strong. It isn't as nasty as it sounds! She seems to spend half her life with her legs in the air. It's more a case of holding her still so she can think about what she's done/doing. Our dog was several months old when I tried this.
I'd NEVER advise handling a puppy roughly and obviously you wouldn't do it to a nervous pup.
It is however, how dogs themselves exert their authority upon each other and they don't get scared or hurt, but understand that (sometimes) they need to do as they are told!