Instruct: Classify the given review into positive or negative sentiment.
Query: Flexibility

I have been doing this exercise dvd for about a month, several days a week, and while I would agree that it is not strenuous, it is an excellent workout for flexibility. I have done many workouts in my life, including P90X, Slim in Six and TaeBo and with this one I have increased my flexibility so much more in a shorter amount of time than with any other I've tried. I look forward to trying the advanced dvd.