I have been sitting on this exercise stability ball for over a month.

No one has really noticed. Except my coworkers no longer come into my office as much except to do a few crunches. I don’t think they like sitting on the ball as much as I do. I think they find it slightly annoying which it can be at times.
Week 1: My back hurt after the first full day of sitting on the ball. After that, my back felt fine. It seemed like it just took an initial adjustment to be able to sit on the ball all day.
After that, I had no back issues. Please keep in mind that I do not sit on the ball for 8 hours straight. I get up, go sit at another desk area, or just move to a different location in the office for a little bit. But, the majority of the time I am at my desk.

Why did I do this?
I noticed my posture was starting to get worse the longer I had a “desk” job. I have been sitting for most of the day for 2.5 years now, and it has definitely taken a toll of my posture. I also wanted to be able to move a little more in my day. Anything I can do to try not to be sedentary is a bonus.
I have also started to do yoga more frequently, and this has helped tremendously with my posture.
The Verdict
Please do not follow my suggestions (do this at your own risk) because I know many exercise physiologists and chiropractors might say the exercise ball is a terrible idea for a desk chair, and say that you need more support. I do agree, that the ball leaves you craving a real chair with a nice back to lean against. But, overall the ball has strengthened my back, helped me move more, and kept me a little entertained!
Guess what else I got this week?

A new glass water bottle! LOVE it. From Lifefactory, but purchased at Whole Paycheck.
I use glass because I swear you can taste the plastic of plastic water bottles even if they are BPA free.