Training every major muscle group in a single workout is usually the domain of beginners, most often characterised by a single exercise per body part for just a few sets. You teach your body to activate and utilise more muscle fibres, rather than realising physical gains in fibre size and strength. This requires greater frequency, and since the volume of work is so low, this workout should ideally be repeated three times per week, with 48 hours between workouts. ~ Berceste