Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Challenging, yet relaxing

I agree wholeheartedly with the previous review of this video. Although there is not a lot of huffing and puffing and leaping around, the exercises provide an excellent strengthening, toning and mental challenge. Among the benefits: better muscle tone, flexibility and posture; improved concentration, skin tone and breathing capacity; and better sleep. I also participate in a weekly yoga class, and my instructor says, "Yoga GUARANTEES a good night's sleep!"I try to do the full workout at least 2-3 times per week, allowing a full hour for each session, and find my performance continually improves. My advice to anyone who has not tried yoga before doing this workout: persevere -- you can't "do it wrong." Everyone has to start somewhere. Trust me . . . you WILL improve!