I'm pretty fit, and tae bo gets me to a sustained heart rate of 145-170, which is about 75-90% of my calculated maximum heart rate. It is definitely a burner.
The Jillian 30DS is basically a 20 min program that consists of 3 min strength, 2 min cardio, 1 min abs. The 3 min of strength actually get your heart rate up pretty significantly (she works little muscles, like biceps, in with larger muscles like quads, while having you move high and low, all of which keep your heart humming). I stay in about the same range for that as I do for the tae bo, except it drops down during the ab portions. She gets it right back up, though, and its a good workout.
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