Instruct: Classify an Amazon review as either positive or negative.
Query: Finally, a difficult workout!

I am a very athletic person - I workout daily (30-40 minutes on an elliptical and some light lifting). I've been trying various different workout DVDs and they always seem to be so easy that I end up adding wrist and ankle weights to give me a challenge. This DVD is certainly challenging! I got it today and tried it after my normal cardio workout. After 4 minutes, my thighs and butt felt like they were on fire and I actually had to stop! I clearly need to build up my muscle in these areas, but I'm going to continue to stick with it and I'm very much looking forward to seeing results!