Most of us can't imagine training ONLY 3 times a week. I don't workout because I have to, I do it because I love it. Limiting something that makes you feel good to 3 X a week doesn't make much sense. With the improvement in equipment, exercise knowledge, supplements(legal and otherwise), recovering from a 5 day workout schedule is not as much of a problem as it might have been 30 or 40 years ago. The leap in size and muscularity of serious lifters that don't juice is proof of this.