I would say rest for at least one day; two days would probably be better. If you want to gain muscle mass, then cut down on the cardio a little bit. I had to eat SO MUCH food when I was jogging 3 days a week and lifting another 3 days a week.
I find two days of cardio and 3 days of ab exercises is sufficient for me to feel good and see results on my abs. It can't really hurt to do more, just be prepared to eat a lot of food to make up for all those calories you're burning.
Also, I would suggest that you do some leg lifts. There is nothing like squats. I recently started doing them. Wow, they are intense. Actually, I do full squats to target my butt a little more, but regular squats do good too.



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