Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Strange Workout

Can anyone explain to me how panting with your mouth open can clear out toxins? Seriously, I was all excited about this DVD because I'm interested in cleansing my liver but I have to admit I was a bit disappointed. By the third day I was wondering if I was doing more harm than good. It's the parts where you do breath of fire with a curled tongue extended that I have an issue with particularly. I'm no expert but I remember from high school Biology that it was better to breathe through your nose because your nostrils can filter out some impurities from the air. Now, if you are sucking in all this breath through your mouth, aren't you just inhaling loads of dust particles directly into your body?