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I'm 5'4 and 130. I regularly burn 325-350 on the t25 cardio/speed workouts. For core and arms I tend to burn 250-275. As a point of reference, I don't take any breaks and I always follow what Shaun t is doing. I do not do the modified versions. My heart rate always maxes out at 180ish. Though mostly stays at 160-170.
