I like to use the stability ball for a lot of different exercises, but some are just too hard to do without having a little more support.
These stability ball bases are great because they keep the stability ball stationary to enable more challenging exercises. This Ironman Stability Ball Base is for use with 55, 65 and 75 cm stability balls. The bottom of the base is notched to allow the usage of bands and tubes for resistance training. What's more? They're great for ball storage as well, since they keep your ball in place (instead of it rolling all over your house). Buy it online here.