[ChachiKiller]

You might be "jogging" (that word is very suspect as most people call it running) and thinking it is cardio but you may not be operating at the levels that will deliver improved conditioning in comparison to your class. LSD is a good answer to your problem but you may be tensing up too much with techniques.

Pick up your mile pace, relax while throwing techniques (throw hard but only at last split second do you contract) and practice these drills on your off days. Also if you sit all day and expect great lung expansion and operation, you will have an issue. On days of your class try to do something that expands your lungs. Maybe a couple minutes of jumping rope or some of these drills. Sitting still all day requires that you exercise more frequently.