the siide to side twiser is a great instrument for the first couple of weeks. After several weeks the side of the twister loosen and I couln't tighten it back up. I finally got a regular chair, sat in it and twisted from side to side. This had the same effect as the twist and it was free. I suggest you get a straight chair as your twister and this way it will save you money and you can do it whever you decide to go, I love the idea of a chair as a twister and this really worked well for me.
4.60 overall from 5 reviews
from $370 at 5 merchants
4.50 overall from 4 reviews
from $899 at 2 merchants