How do you help balance?

Answer 1

The Middle Ear has a set of three loops of tube on planes roughly perpendicular to each other: the Semicircular Canals.

Within these are nerve-endings fitted with tiny hairs, all submerged in a fluid that fills the Canals. As we move, the fluid moves, wafting the hairs to stimulate signals sent to the brain for processing into compensating-movement orders to the muscles.

The Semi-circular Canals are therefore combined accelerometers and inclinometers, in a feedback control system.