Joined: 10 Nov 2008
I know this sounds like a wimpy way out, but the best way to answer your question I can think of is to look at other people's profile positions during their approach, and how steady they are through their approach, as it is their positions through each step that make their game solid.
Personally, I've found that the women pros are a lot better at this than men, though there are those pros that have had solid positions throughout their career. With that, hit up youtube, and look for the following bowlers:
Parker Bohn III
Brenda Norman Mack
I know there are many others, but those stand out the most with posture and positioning. I know others will chime in, and if not, I'll pull out one of John Jowdy's books and post what he has to say as well.