Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pretty Hardcore for only 20 minutes

I bought this DVD because even though I work out every day for a little over an hour, it was more like zoning-out. That having been said, even for a more Intermediate-Advanced exerciser like myself, it is VERY high impact. If you're nursing some injuries, even old ones, this may not be for you. I know that after jumping up-and-down for 20 minutes straight my ancient hip injury started to bother me again. Truthfully, I will probably only do this workout when I don't have time for a trip to the gym. But I find her encouraging remarks and approach to exercise useful and will apply it to my regular workout.