Suppose we recruit 600 students to participate in our semester-long cohort study to see if there is an increased risk of injury among runners that do not stretch before running. Among all our participants, suppose 400 report that they do not usually stretch before running compared to 200 that do. Among those that do not stretch, 131 reported a leg or foot injury compared to 197 of participants that to routinely stretch before running. What is the relative risk and risk difference