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@badtmy
they have these in the gym where i go. i've never used them, and always thought they were a wank... never seen an olympian using one etc etc...
BUT i asked my mate BJ who is a personal trainer and an elite 400m hurdler, and he reckons that it's not a complete load of toss. it does help with core strength and stability. if used correctly it can certainly build core strength quite effectively.
of course, so does a swiss ball for a whole lot less money, electricity and noise. i think the idea is that the machine introduces lots of instability which forces your core stability muscles (and the associated neural pathways) to adapt quite fast.
you can do this with a swiss ball, a couple of varying weight medicine balls and the right exercises (and ideally a mirror so you can monitor your body position).
but if the classes are free, why not give it a go?