Gaiam Classic Balance Ball Chair
You sit for hours. That's the plain fact behind most desk-related aches, and it's why a chair that makes sitting slightly active is one of the most sensible things you can put in a workspace. A balance ball keeps small stabilizing muscles awake instead of letting everything switch off.
The Gaiam Classic Balance Ball Chair sets a 52 cm stability ball into a supportive frame with a backrest and wheels, so you get gentle core engagement and posture work through the day without perching on a bare ball. It comes with a pump and an exercise guide, and the ball lifts out when you want to stretch or roll through a few moves between meetings. Use it as your main seat or a swap-in for part of the day.
It won't announce itself as exercise equipment, which is the point, it just quietly turns the hours you're already sitting into something a little better for your back.