Unless you lift 5 days a week, you should do back and bicepts on the same day. When I was bodybuilding, my workout schedule was just lifting with the weekend to run and rest. Now my workout schedule is this during the off season of rugby:
Day 1:
Pushups
Armstrong Pullup Program
3 mile run
Day 2:
Pushups
Armstrong Pullup Program
Back and Biceps
Day 3:
Pushups
Armstrong Pullup Program
10-20-30 interval run
Day 4:
Pushups
Armstrong Pullup Program
Chest and Triceps
Day 5:
Pushups
Armstrong Pullup Program
10-20-30 interval run
The Armstrong program can be found here:
http://armstrongpullupprogram.com/
The 10-20-30 is just sprint 10 seconds, run 20, then jog 30 for 5 minutes. Then take a 2 minute break. Repeat for 3-4 sets.
I hope this helps someone.
During the rugby season I have rugby 6 days a week (sometimes even 7). I will only lift twice a week.
And when I was body building you would spend a day on chest, a day on back, a day on triceps, and a day on biceps. The last day would be legs and core.
Good luck!