Not very long ago we talked about the phenomenon of office chairs made from exercise balls. Some of you love them, some of you hate them and others were just as curious as we were. Our brother blog, Social Workout is clearing the air today with a few surveys that say these ball chairs are really a bunch of bull!According two separate studies done in 2008 and 2009, the exercise ball chair doesn't really do much for your body, your health, or your posture. Results indicated that users of the chair did lose an additional 30 calories a day but that there weren't any improvements in posture — though using the chair was linked to spine shrinkage. It does however help strengthen your core, but not by a measurable amount.