Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good intermediate workout, really sweating

i really like kathy smith because she always seems very professional. i'm against super perky style instructors. with rod stryker, there is a lot of good instruction; kathy acts like his demonstration student. the music and lighting is non obtrusive and restful. it's hard to do the poses and follow them while watching the tape, so you have to learn the routines first. i was amazed how much hatha yoga makes you sweat without feeling any soreness. it's great intermediate (not advanced) workout whichgives a great nonjarring workout.