I've had lower back issues for years. In the past I was good about going to the gym and working on my core strength and this did an excellent job of keeping the lower back pain away. However, over the last few years I have been lax in going to the gym (read: I cancelled my membership and don't plan to re-up). Due to my lack of working on core strength my lower back pain has been creeping back and now I need to address it again.
I'm thinking about buying a stability ball and using that at home to do core work 2 or three days a week for half an hour or so. Does anyone have any success stories using one of these balls for core work? Does anyone have any suggestions for exercises to do? I found this link with three simple exercises that I may try. Would these three alone be enough to improve and maintain core strength?
Also, what is the key to deciding what size stability ball to buy?