Wobble/Balance cushion for core strenght?

[Tickles]

Due to being unwell last year and very busy this year I'm not getting to ballet as much as I'd like. So, was thinking of getting a wobble cushion/balance thing to sit on in the office for maintaining core strength for riding. Has anyone got any recommendations? I want to get somethign that isn't too easy to balance and also that doesn't sink into the padded seat of an office chair.

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[Steorra]

I'd never heard of these but they sound like a great idea!

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