Iron waist plate is still worth starting with, durable and effective. In my case, for example, I feel very uncomfortable after sitting for a long time. I have scapulohumeral periarthritis and my waist is a little uncomfortable. I usually have to stand up and exercise to relieve it. It won't be uncomfortable to sit with an iron back for a long time. Of course, I'd better avoid sitting for a long time I heard that the iron waist plate instrument has a patent and has won many honorary certificates. It is a more affordable and powerful brand. I really feel good after using it for a while. ?