Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Great video! However...

I found that this video was very good -- it works the muscles it states it will work. HOWEVER -- if you don't know the "routine" it is a very hard video to follow. Once I learned the actual moves, it was easier. It does work, don't get me wrong, but it definitely should be watched a few times before even attempting it.