Twice a week I attend a one hour boxing fitness and circuit training class at my gym. Here is a video of one station of a three minute boxing circuit training routine. Most circuits in the class include one station on the heavy bag; one station by the stage, usually legs or calisthenics; and one station by the mirrors, usually for abs or core exercises. We do each station for one minute and then rotate. We usually repeat the 3 minute circuit twice, and do a total of 4 different circuits for a total of 8 – 3 minute circuits. It makes for a tough, but fun class.