Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One of the hardest, most effective videos I have ever done.

I am young and in pretty good shape, and this video still gives me a beating. It's well over an hour of solid sweating. Doing the video a day or two without weights would be a good idea, until you master the tricky steps. I get the feeling some of the quick bends with weights and fast repetitions might not be the safest, so I'm really careful with the knee bends, etc. It might be too much to do every day, but I use it every now and then when I need a good sweat. The only things that bother me are: 1) it's old and slightly cheesy; and 2) Janet Jones is so "perfect" it's annoying. Other than that, a good bang for your buck.