The definition of physical activity is "any bodily movement produced by skeletal muscles that results in energy expenditure."

In simpler terms, that means any activity that uses large muscle groups as opposed to sitting or lying down. Running, climbing, jumping, tumbling, you name it. The idea is to get students moving.

Physical activity doesn't have to be continuous to be healthy, either. Doing chores around the house counts. So does walking to school. But playing video games doesn't.