Is it true or false that a reflex action is movement your body does automatically?

True.

A reflex action is an automatic, involuntary response to a stimulus. It is mediated by the spinal cord and does not involve the brain. Reflex actions are important for protecting the body from harm. For example, if you touch a hot stove, you will automatically pull your hand away from the stove before you even have time to think about it. This is a reflex action.