The idea behind using an exercise ball instead of an office chair. The idea of sitting on an exercise ball instead of a traditional office chair is that the instability of an exercise ball requires the user to increase trunk muscle activation and thus increase core strength, improve posture and decrease discomfort. What Health Experts Say About Exercise Balls as Chairs. The medical community, however, is at best inconclusive about the health benefits or disadvantages of using an exercise ball as an office chair. How to Use an Exercise Ball As a Chair. An exercise ball is a useful workout tool that helps to increase balance and strengthen the core muscles in your back and stomach. These muscles support your spine and help to take the burden of Stuart McGill, PhD. in “Low Back Disorders” cautions against the use of an exercise ball as a chair if you have lower back pain. If you experience increased lower back pain when using the exercise ball as a chair, discuss with your medical provider and consider discontinuing use. I recently came across this article, which talks about using an exercise ball as your home or office chair. I have used an exercise ball as a chair before, and it was thoroughly enjoyable. Here are some of the benefits of using an exercise ball as your chair. Is swapping your office chair for an office chair the secret to a strong core? That depends. Search. Subscribe. Using an exercise ball counteracts both of these things.” Although you can .