Instruct: Classify a given review as either positive or negative.
Query: I Feel Great!

I used to be somewhat flexible when I was younger, but not anymore. I have been having back problems lately and my doctor said it would help if I were more flexible. I have been doing this DVD for about a month and I am feeling better in so many ways. I really started to feel the results after a week or so when I began to feel a better range of motion. It's not often that something comes along that feels like it can really change your life.