Mine is Cathe workouts, and another course, in dietetics, as well as a class in intensity training, so now I can work people at their *best* intensity level, so they burn the most fat, until they just have to have their normal high intensity in the workout as well. High intensity and doing it doesn't always mean the best fat burn. Find that right there, was well worth the weight of gold, as it's awesome, to bring someone's intensity down to whatever their level is, and watch them nearly burn 300 calories of pure fat during a workout.
Kit