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It takes a fair effort to slouch on a yoga ball. It’s unstable. There are a number of wobbly chair designs that force one to sit correctly, and that strengthen
by moistly 5y ago
It takes a fair effort to slouch on a yoga ball. It’s unstable.
There are a number of wobbly chair designs that force one to sit correctly, and that strengthen core muscles. Well worth looking into them, IMO.