Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not up to Crunch's usual standards

I usually really like Crunch videos, but I can't recommend this one. I've been doing step aerobics for 8 or 9 years, but I found the moves in this video to be too complicated to be effective. You spend so much time concentrating on trying to follow them, you end up hardly breaking a sweat. Also, the production quality is not up to the usual Crunch standards, either. If you want a short, fun step workout, skip this one and get Reebok's Dance Step with Petra Kolber -- like this video, it has a quick pace and assumes you are an intermediate-or-better stepper, but it uses basic and moderately complicated moves instead of the unnecessarily complicated ones this video uses.