Sit-Stand Chair: sitting, kneeling, and standing

http://www.healthpostures.com/ergonomic-computer-chair.cfm

Stance Angle Chair

Informative Image: Three pictures of people using the Stance Angle chair with adjustable monitor and keyboard. One person is sitting. One person is kneeling. One person is standing.

Changing postures can also help to strengthen back

Note height adjustment on monitor and keyboard