Which small ball do you recommend for workouts with the overball? It looks like there are a few different sizes which are available - anything from 22 to 26 cm.

Hi Jessica, great question. You'll typically see us using a ball that is about 9cm in circumference. We have used several brands of small balls here at our studio, but I believe this is a fairly standard size in the 'small ball' category. Hope that helps!

Thanks Amy! How about the diameter for the overball workouts? They look like they're in the 20-25 cm range.