I would vehemently disagree with the statement that it's "Facebook for gym rats" or that it doesn't provide value outside of updating your FB profile with your workout logs, but thanks for the opinion.
sorry if i sounded harsh. ok, it has specific badges and plenty of stuff for motivation, and i think that was your main goal. nothing that actually guides or facilitate, which was what i was expecting, maybe.
All of my running friends already post daily to their facebook status how many miles they've run that day.