This ab challenge is the best way to lose belly fat and strengthen your core muscles. Most of the people think that the abs are probably the most important muscle group in the body. All of you, whether you care about having toned abs or not - train
Great cardio circuit with or without the treadmill running portion! You could also put these in between other body weight exercises to keep your heart rate up during HIIT (not that you necessarily need more cardio for that!