Train Like a Fighter!! Boxers are some of the fittest athletes in the world. This is a Boxing based workout. Learn how to throw punches and put together effective combinations, hitting the punch bags. Punchbag training offers an incredible workout, raising your heart rate, the resistance of the bags helps to condition and tone your upperbody and core. In between rounds of boxing you’ll be doing circuit based exercises to strengthen and tone the body as well as raise your metabolism.