Why hire a trainer when all of the information is in a book or online?

While perusing the web-based exercise blogs, I stumbled upon a great blog about exercising based on a book, internet source, or magazine article.  A personal trainer and owner of a gym (Larry) tells it how it is, not how most see it.  Many people base their exercise programs on magazines and books, while you get some from this you don't get everything.  Like he puts it, its like dancing, tennis, skiing, and other sports.  Who knows if you're doing the exercise correctly, at the right pace, breathing, rest, repetition, even weight load.  Most who succeed at these have or have had some a coach/trainer to learn correct technique, no professional exceed based on books or the internet, it is the trainers.  It is essential to have someone show you how to do certain lifts and teach by example.  I thought that this was a very interesting blog from this guy Larry, he gives a great example of how the internet is taking over even the physical aspects of life, exercising. 

Web URL - http://www.betzmethod.wordpress.com/2008/10/01