If you’ve resolved to get in better shape or improve your posture without any actual time commitment, these discounted balance ball chairs can help you get it done while you’re sitting at your desk.

Amazon is offering the iconic Gaiam Balance Ball Chair in a variety of colors for $60, today only. That’s about $10-$15 less than usual, and if you’re on the fence, you can check Lifehacker’s impressions of the chair for an in-depth review.