Modifying My Workout/Exercise Routine?

CURRENT WORKOUT ROUTINE (I am 29; M; approximately 140 lbs; and in great athletic shape):

- 3 Days of Intense Cardio (Running 8-9 Miles)
- 3 Days of Intense Upper Body/Abdominal Working Out/Exercise

I am finding that this routine, which I have been doing for years, is sort of burning me out and only giving me one day of rest per week from exercising/working out.

For those personal trainers/serious exercisers, do you think the following will be a decent improvement to my workout/exercise plan and not cause any major changes to my body?:

- 2/3 Days of Intense Cardio (Running 8-9 Miles)
- 2 Days of Intense Upper Body/Abdominal Working Out/Exercise

Overall, I figure that 2 to 3 days of rest per week will be beneficial, allow me to have a better social life, and have me appreciate my routine a bit more.

Thanks to everyone for your time and feedback!

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