I have a friend who was training only 1x per week for a few months in his offseason this year. He worked full body in three workouts, each bodypart once every three weeks. While it may seem he wasn't training enough, he was getting stronger every workout. He's preparing for a competition now so he's upped his routine to about 3-4x per week. I just find it interesting some people grow on one end of the extreme(6 days on and one day off) and others grow on the other end of the extreme(1 day on and 6 days off).