Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Amazing relief-simple to use

A friend lent me her miracle balls several years ago after she had her own miracle with them. I was suffering from back and hip injuries after a 2nd car wreck and was skeptic these little balls would help. But they did, they were amazing. I could definitely tell a difference from day to day as my body loosened up. She ended up buying me my own set for my birthday! I now suffer from Fibromyalgia and cannot afford massage very often and these balls do as well a job on tight muscles and joints as a massage does! My daughter even uses them to relieve tight leg, butt and back muscles after a long day on her feet working in the hospital. She had not used them before and was skeptic when I handed them to her. She came into my room a little later and told me how much better she was feeling after she used the balls and she requested her own set for Christmas!