Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Toning System

These are very hard to use. The red one you use on the inside of your thighs hurts after a few reps. Because of it's design, it is twisted at the center which causes the arms to turn in an awkward way, making it hard to keep in the same place on your legs. I have to keep adjusting it and I am usually sore afterwards. The blue one works better as far as twisting goes, but you can't spread it out very far.