Checkout these pictures of professional bodybuilder's back muscles throughout the ages. The first one is of Dorian Yates in 1995, the second one is Ronnie Coleman in 2001, and the third is of Arnold Schwarzenegger back in 1974. You can tell the building of muscles has developed throughout the ages. I have to say Ronnie Coleman's back is just extraordinary looking. And Dorian Yates back muscles are just plain sold bulk, he just looks like a rock! Arnold is still worthy for his time, he had a very wide looking back!