I sometimes like to make it so that it works the muscles that are used directly and indirectly. Maybe once every 8 weeks I'll do this using supersets.
Chest/triceps
Back/biceps
Shoulders
Legs.
Considering doing a set of very heavy leg press every day to get my legs up to par. Or maybe leg press, then next day squats, then next day hyperextensions, then ham curls then finish off on Friday with calf raises.
All really heavy. All out for 20 reps.