Here is a board designed to improve your balance, core strength, stability, and posture. The YogaBoard from Powers Yoga has a 1/4″ yoga mat and 3 inflatable 14-inch cushions for balance training indoors. The board has a footprint of 66 x 16″.
A hand pump is included, so you can easily adjust the amount of air in the cushions to get your desired level of instability.
[where to get it] [official site]
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