you're going to think I'm crazy, but as a 'Weight Watcher', I'm always looking for ways to put exercise into my day. When I don't use my swivel, low armed office chair, I'm on my YOGA ball!! It helps me to stay balanced and makes me hold my stomach tight. I don't stay on it for more than 20-30 minutes of sewing, but when I'm done, I feel like I've really worked my core!!