Lots of full body exercises actually work the abs as much as an isolated exercises like crunches. But as others have noted, it is really the aerobic exercise that will help burn that layer of fat and allow the pumped and primed abs to show through!
I totally believe 60 days of pull ups would bring out the definition on your tummy, VA. Thats quite a challenge!
To lose fat may be in one day or two is not at all possible. There are many things you need to consider as wrong sources to lose weight, as they can harm your body in many ways. However, instead of thinking of losing weight, you can see more results if you concentrate on healthy food and maintaining good fitness of body.
My husband and I started using supplements from a company called Advocare. They have the most amazing products, and I've never felt better. He used their 24 day challenge and lost 17 pounds while on it. He still wants to loose more but it was a great kick start without having to do any crazy dieting. Of course you still have to watch what you eat put it did give you some structure and also gave you energy while you got through it. If anyone is interested please let me know, the stuff is awesome!!!