A manually-operated device intended to support and position a patient (disabled and/or discomforted) in a sitting posture while performing activities of daily living, including work-related activities. It is designed with ergonomic adjustments to provide improved personal body posture and/or to help prevent/reduce physical problems associated with poor mobility or sedentary lifestyle. It typically includes a variety of mechanical operator functions (e.g., height and position adjustments), often pneumatically-powered, and has wheels for ease of mobility. It is not a wheelchair.