Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good DVD

I have had a stiff lower back on and off over the last few years and this DVD, along with improving my core strength at the gym, has resulted in much less problems. I would recommend it for anyone who wants a low key approach to improving their back/hip problems. I also found it great as a relaxant before going to bed at night! I think they suggest doing it once per day, but I found a couple of times per week seemed to make a difference. Could possibly get boring quickly if you were doing it once per day.