Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Challenging

I found this tape very challenging. It is all based around strengthening the stomach. I found this to be much easier than yoga. She makes it very easy to understand all the moves. I actually sweated somewhat. This is a great tape dispite Denise Austin's ability to go on and on forever. You kind of have to tune her out but it's the easiest and most effective tape I have found so it's definatly worth it.