Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very tough

I work out 6 days a week and was getting bored with my routine. I decided to give this dvd a try and see what Jillian Michaels was all about. OMG, this is tough. There are no breaks to rest and she works each muscle, exhausting it rather than alternate moves. It's been 2 days and I am still very sore. You will love it, give it a try.