Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: What brand and size ballet bar do you recommend?  What bar do they use on the video?
Document: I don't know why more people don't buy these videos. My favorite is the 57 full body workout. With that said, the 30 minute workout is a nice break when I am sore.I can't recommend this workout video more highly.
I save the express workouts for evenings after work. The express workouts are NO JOKE, though; I'm usually more smoked after completing them, so don't think you're cheating yourself by working out for only 30 minutes. What can I say? Obviously I'm hooked; I even purchased VitaVibe's freestanding portable ballet barre (Amazon carries that, too) so I don't have to use the back of the couch as a makeshift barre anymore.
After doing it for a couple months, I still can't complete all the reps for a few exercises - and I usually run and lift weights 5 days/week at the gym, so don't think because you're not using heavy weights that it's not challenging.For all these reasons, I highly recommend you try this awesome workout video!
In three weeks, my [...] was lifted, my legs were trimmer and abs tighter. In addition to doing this DVD for about 3 times a week, I also did interval cardio on a treadmill (about 15-20 min) and ate a low carb diet. In a month, I dropped 10 lbs, which for me was huge since I'm small to begin with but I wanted to look great for my wedding. In any case, I highly recommend this video.
I am in pretty good shape. I workout every morning before work, have done the tracy anderson metamorphasis, as well as many of the Jillian Michaels workouts. This workout isnt so hard, as much as you feel sore right after doing it. You know you have done something which I love! The ball that they sent with it is not the balls they use in the video and I found them to be really poor quality.
I have had the Physique 57 system for over a year, but just started using it in the last two weeks. The only thing that I'm disappointed about is that I did not use this system sooner. While only in the beginning stages, I HAVE seen change that I didn't think was possible. (I've been alternating the 57 minutes video and 30 minute videos 5 times a week. I usually work out two days and then, take a day off.) I haven't changed my eating habits.
Amazing workout video. You will feel a major burn in your thighs, butt and abs. I wasn't crazy about the arm section although it is still good; for that I use Tracy Anderson's method, which gave me great arm definition. The instructor is very motivating. I read a comment where someone found her annoying. The instructor's motivation made me work harder. I hope that if she ever develops more DVDs that she continues to be as motivating. It's a super tough workout.
This is an amazing product. I have ordered all kinds of workout dvd's and video's over the years, but this is by far the most amazing! You use all your own body weight as resistance. This is fun and effective. I would recommend this product to anyone that is interested in a low impact, highly effective workout!
I am not fan of this set. I find Tanya annoying. If you can, take a bar method class if available. It uses the same "Lotte Berk" method and instruction is amazing, spot on and it nevers gets easy.
I used to go to Lotte Berk in Manhattan, Exhale for core fusion, and I moved to NJ so I have not been able to go to physique 57...I decided to order the DVD. If you are familiar with bar workouts than this is for you. I found the core fusion DVD's to be very slow paced. But, I just did the half hour express workout while my baby is sleeping, and I loved it.
Answer: yes