Ha, much appreciated for the props. That cheapy version is the one I used to help kick off the rocker trend.
Since then, we’ve seen a range of more and less complex versions far and wide. That one is not terribly hard or expensive to make, but still goes further than some have for tools and comfort level. I popped into my group to snag just a few pictures of some of the more simple versions. Most of these use “balance pods”, but those can easily be substituted for any of the foam blocks I mentioned. The other common hack is tennis balls, which are easy to access as well. Many ways to make a simple version to at least see of some motion is an improvement.

