The hands and feet begin to lose sensation.

The body’s temperature-regulating mechanisms work harder, demanding more energy.

Shivering begins — the body’s attempt to generate heat through muscular activity.

As Jean walked through the dark Minnesota night, these processes were running in the background of her experience.

She felt the cold, she felt the effort of walking through snow, she felt the growing discomfort of her feet in those cowboy boots.

But she kept walking, because stopping was clearly worse than moving.