I lift 5 days a week with no problems. What I normally do is:
Monday: Shoulders
Tuesday: Chest
Wednesday: Just cardio + abs
Thursday: Back
Friday: Legs
Saturday: Biceps/Triceps
Sunday: OFF Completely
My muscles are in a lot better shape then yours are considering I've been dedicated to lifting for awhile now. I'd so something like:
Monday: Shoulders/Biceps
Tuesday: Skip or light cardio + abs
Wednesday: Legs/Back
Thursday: Skip
Friday: Chest/Triceps
Saturday: Light cardio +abs
Sunday: OFF
It's completely up to you but I would one day off lifting in between workouts.
My workout routine is basically the same, but I workout my abs Monday-Friday and rest them on the weekend, and I do cardio almost every other day.