All33 Backstrong Chair Review. Our final recommendation is that the all33 backstrong chair is a product that’s worth trying if you’ve got chronic low back pain and spend a lot of time sitting. According to all33, the optimal height range for this backstrong chair is 4′ 11″ to 6′ 1″ (151 to 186 cm).All33 Chair Canada ukzsofa from uk-zsofa.blogspot.comNot only...