ive had a few kick boxing lessons and some mixed martial arts lessons at my old gym i used to train at, i dont know much at all, i do know the basic jab, cross, and hooks and stuff and how to punch without breaking my hands and wrists lol but im interested in the fitness aspect of boxing and would like to know of any good routines for hitting the back that any of u may kno of, id like to do it 3 times a week or so as my cardio, ive always admired fighter;s physiques...thanks guys