Take it from me, you can make progress training just three times a week as long as you give it all you've got when you do train. The four days rest will work wonders for recovery, growth and strength.

I've tried the Dorian Yates and Mike Mentzer style and just couldn't get it right. I've also spent years training six days a week with very good results. But now I'm older and have cut back to 3 or 4 days weekly I'm getting as good if not better results.

Might not work for everybody but I'll bet those who think it doesn't work haven't tried it.