If you post your stats (age, weight, bodyfat) and goals (get lean, get big, run fast, lift heavy), I might be able to point you to a workout. I'm not a professional, and I'm not even impressive, but I read a lot
IMO, you're working your upper body four days a week and your lower one. That isn't very ideal for fatburning OR getting big. If it's just a piece of your overall plan (like if you just hit the lower body really hard for several weeks), I apologize.
Complementary muscles work in opposite directions on the same joint(s). For example, biceps and triceps pull the elbow joint in different directions. Other examples are chest/back and quadricep/hamstring.
Complimentary muscles work together during a lift. Chest/shoulders/triceps during an incline bench or dip would be an example. Hamstrings/glutes during a deadlift would be another.
I've done workouts that have splits of chest/shoulders/triceps one day and back/biceps another day, which is a complimentary split. Your workout is chest/back and triceps/biceps, or complementary. Either is fine as part of a well-rounded program.
I've given up (for now) trying to outthink the smartest guys in the field. For the past six months, I've been doing professionally designed ones. I haven't done a tricep/bicep exercise in at least five months. Results? My arms are 3/4" bigger...and I'm DIETING/CUTTING! Another interesting note: I hadn't flat benched in three months until Phase 3 of Homegrown. Results? Probably a new personal best - I know for sure that my 5RM is a record. Weird? Yeah. Normal? I think so. These guys (all around this forum, their magazines, etc.) are smarter than you and I. I'm at least a year from designing my own program, and I plan to ask for help even then.
Get some stats and goals down, if you want, and I'll try to help more. If you're a pro and I'm talking down to you, I'm sorry. It's hard to tell in a forum
