[I could not find an answer to this after some searching. I cannot imagine that any question has not been asked before, so I apologize if this one has been over-done.]
I often see back/biceps and chest/triceps groups put together for a workout.
What is wrong with doing Chest/Back and Biceps/Triceps, so that opposing muscles are being worked out on the same day?
e.g.
Mon Back/Chest
Tue Off
Wed Biceps/Triceps
Thu Off
Fri Legs/Abs
Sat Shoulders
Sun Off
Your thoughts?