Why? Because they weren’t learning , or relearning balance. Balance is a complicated trick of the brain and body. It involves a highly complex blending of proprioception (the brain awareness of how much each muscle is flexed, leading to a constant knowledge of the body’s posture in space), and vision, and inner ear which informs of our verticality, and rotation. The brain constantly calculates and recalculates these inputs and tells each muscle what to do for us to stand up and remain firmly upright.