Sitting stool Topstar Sitness 20 SI69G23 — grey, mobile balance stool for active sitting

The Topstar Sitness 20 SI69G23 is a grey mobile balance stool designed for active sitting and improved posture. Its compact design encourages subtle micro-movements while seated, supporting engagement of core muscles and reducing stiffness during periods of work or study. The stool provides a space-saving seating option for home offices, classrooms and other short-duration seating needs, combining a stable base with gentle instability to promote a more dynamic sitting experience.

Advantages

The Sitness 20 offers a balance between stability and mobility: the slightly convex seat and flexible base facilitate controlled rocking and tilting to keep the body active without compromising safety. Its compact footprint makes it easy to move and store, while the height-adjustable mechanism allows adaptation to different desks and users. Constructed with durable materials and a slip-resistant base, this stool is intended for regular daily use where active sitting is desired.

Suitable for

• Home office work and remote study sessions
• Short meetings or collaborative spaces
• Classroom activities and educational settings
• Workshops and standing-desk alternation

Key specifications

• Color: grey
• Seat type: rounded, slightly convex balance seat for active movement
• Height adjustment: gas lift or pneumatic height-adjustment range suitable for typical desk heights (adjustable)
• Base: stable round base with anti-slip surface for controlled rocking
• Intended use: indoor seating for short to medium durations, active sitting
• Construction: robust frame and wear-resistant seat covering designed for frequent use

How to use

Adjust the stool height so that your thighs are roughly parallel to the floor and your feet rest comfortably on the ground or on an anti-fatigue mat. Sit centrally on the rounded seat and allow small forward, backward or side-to-side movements; maintain an upright posture and engage your core muscles lightly. Use the stool in alternating intervals with a conventional chair to avoid prolonged static positions. For tasks requiring extended concentration, combine short active-sitting periods with regular standing breaks.

Usage recommendations

Use the Topstar Sitness 20 on flat, even floors and avoid using it on inclined or slippery surfaces. Begin with short sessions to allow your body to adapt to increased micro-movements and gradually extend sitting periods as comfort improves. Pair with a suitable desk height and ergonomic accessories (footrest or anti-fatigue mat) to optimize posture and reduce strain.