7 DAY challenge: have a shakira belly!!

If you want to build muscle and burn fat at the same time, you have to perform circuit training, three days per week. How can you achieve this? Indulge in full body exercises like lunges, push-ups, and pull-ups, for one set of 15 repetitions. Don't forget to follow every exercise with one minute of jumping rope. You should be able to burn around 500 to 600 calories per workout.