Why four points of contact can feel steadier
Standing upright means keeping the body’s center of mass—the point around which its weight is balanced—over a relatively narrow base formed by the feet. The brain must continually coordinate muscles and adjust posture to stop the body from tipping. If balance and coordination are impaired, that task can become difficult.
Putting the hands on the ground creates a wider base with four points of support. Each hand or foot can help catch a shift in weight, making movement feel more secure even though it requires a very different pattern of muscle control. For some Ulas siblings, this was a practical way to get around, not simply a chosen variation on ordinary walking.
A stable workaround, with a human cost
The siblings’ gait is associated with a neurological condition affecting balance and coordination. Their bodies’ solution did not make the hands equivalent to feet: human hands are built for dexterity, and bearing weight on them changes how the shoulders, wrists, and trunk must work. The four-limbed posture could offer stability while also limiting how easily they moved through everyday environments.
That distinction matters. The gait shows how a person may adapt movement to meet the immediate demand of staying upright; it does not mean that walking on all fours is generally easier for humans. A broader base can trade speed and freedom of movement for a steadier path forward.
