A level sitting surface won't allow your spine to curve naturally. I don't know why, but most people are not aware of kneeling chairs or the benefits they prov

A level sitting surface won't allow your spine to curve naturally. I don't know why, but most people are not aware of kneeling chairs or the benefits they provide to back posture. There is literally no way to get healthy curvature in a sitting posture without lowering your knees below your hips.