Gaiam Classic Balance Ball Chair

Pros

• +The cheapest way to test active sitting, well under either dedicated wobble stool
• +The original, most widely reviewed active-sitting format
• +Inflatable ball still requires active core balancing
• +Simple to adjust height via ball inflation level

Cons

• −The least directional stability control of the active-sitting formats we compared
• −Height is set by inflation rather than a precise mechanical range
• −The inflatable component is the long-term wear item
• −Less refined than a dedicated rocking-base wobble stool