In 1986, Ralph Paffenbarger followed 16,936 Harvard alumni for 16 years.

He asked a simple question: Does the amount of energy you spend moving predict whether you live or die?

The answer…

Alumni who burned 2,000+ calories per week in physical activity had death rates 25 to 33% lower than those who moved less.

The activities were simple. Walking to work. Climbing stairs. Playing recreational sports.

No gym memberships were required.

By age 80, the active alumni had gained 1 to 2 additional years of life compared to sedentary classmates.

This was one of the first major studies to show that the volume of habitual movement, not the intensity, or the specific activity, drives survival.

Morris proved it with bus conductors in 1953. Paffenbarger proved it with college graduates in 1986.

The prescription hasn't changed.

Move. Consistently. For life.