Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Yes, It IS tough!

The Firm series is honestly the best. I've tried several aerobics tapes -- some are tough and some are fun and some are impossible. This one is tough in the best way -- you can make it even tougher and they tell you how. I still can't get all the way through this 45-minute workout without stopping. It's pretty difficult. Just learning it was hard -- which is GOOD, really; My coordination is improving. This video isn't for quitters, but then no aerobics tape is. Go for it!