how are you burning so much?!?
ok, this is my second round of insanity, and i see some of you posting your burning up to 1000 calories per workout. i want to know how. today, i had the plyo cardio circuit, i pushed as hard as i could, even did more reps of some exercises then the people on the vid, and i only burnt 391 cals in 43min. how long do you…
