Review on Tumaz Wobble Cushion: The Ultimate Solution For Improved Posture, Focus, Pain Relief, And Core Strength by Bill Garczynski

This is great. I haven't bought any other comparable brands, but the quality on this cushion is awesome. It feels sturdy and gets the job done. I think the only complaint I have is about ME! I knew going in that my core is pretty weak after years of working a desk job and feeling like I'm falling apart after a few crunches. I figured that this could help me build up some much needed core strength while I'm working, and it does! My advice is to take it slooooow. 10 minutes at a time, twice a day, or even less. I tried it for the first time yesterday and my core was aching all day afterwards from muscle fatigue (which I think is a good sign!) Even just sitting there were a few points where I felt TIRED like I just finished a workout! Another note as a warning to others in the small percentage with this same problem: I have costochondritis, and working on these specific core muscles caused some inflammation which makes it feel like there is some tightness in my chest and it's a little harder to breathe (like the typical costo feeling). Other than that, I have zero complaints about this product. It's great and does what it's supposed to do - again, my only complaint is the fact that I'm so out of shape!