Also some of Jillian's videos are on youtube if you want to check them out.
I really like them. I would generally not think I'd approve of such high impact, jerky exercises since I have some occasional lower back issues and old shoulder injury, but I've found that my core is really strong now and my whole body feels REALLY fit. I've been doing them 4x a week for a month and I'm not thinner, but that has more to do with diet I think. Her videos are REALLY hard at the beginning. YOu might not make it through unless you're in great shape already. Go slow, and you will get strong!
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