The five vital signs that measure a person’s health are blood pressure, body temperature, breathing rate, heart rate, and pain. However another vital sign that is becoming clinically recognized as a critical indicator of health is walking speed. In a recent meta-analysis review, walking speed was a highly accurate predictor of life expectancy than just age or gender. In fact, walking speed predicted other health indicators such as cognitive function, mental, and physical well-being. Within this series we will explore a set of studies scientists used to make these claims and what we can do to live longer, healthier lives.