running and Weight. It has been found that people who exercise regularly by running tend to weigh less than those who do not run, and those who run longer distances tend to weigh less than those who run shorter distances.

In each case, state the correlation clearly.
(For example, we might state that “there is a positive correlation between variable A and variable B.”) Then state whether the correlation is most likely due to coincidence, a common underlying cause, or a direct cause. Explain your answer.