What is a "major life activity"?

A major life activity is an activity that is of central importance to the daily life of the average  person in the general population.  Major life activities include, but are not limited to: caring for oneself, performing manual tasks, seeing, hearing, eating, sleeping, walking, standing, lifting, bending, speaking, breathing, learning, reading, concentrating, thinking, communicating and working.  It also includes the operation of a major bodily function.