By Fitness Contributor Regina Perez
People make the common mistake of doing hundreds of crunches and sit-ups thinking that their abswill appear. In reality you have to decrease your body fat percentage to get those abs to show. The most effective exercise are; interval training, adding weight resistance to the workouts and eating healthy. Everyone wants rock hard abs but do you want to put in the work to achieve those results? If so I am going to tell how you can do it in a matter of time.