Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very good yoga DVD, but needed more instruction.

There are many yoga DVDs out there that are simply not challenging enough for me and this one did. Although the poses themselves are not difficult (many basic postures), Bob has put together a very nice advanced yoga flow.With that being said, my main concern with this DVD is alignment. If you do not have a proper background of yoga, then this is not a good place to start. Alignment is super important and he only touched on it a few times. I noticed a few of the poses where the people in the DVD were out of alignment and no explaination was given to fix it.But, overall, if you are looking for a more challenging/advanced/power yoga type of DVD and understand proper form, then this is a good buy. I am looking forward to using this one again and growing stronger from it.