This is an fun, active, outdoor lab that requires students to time their classmates who volunteer to run a 50 meter sprint. Students will calculate average speed during Part 1 of the lab and instantaneous speed during Part 2. They will also create a colored multi-line graph in which each runner is shown as a different colored line. This is an exciting lab because it is athletic and competitive but it is also academically demanding since students will be averaging, calculating, and graphing. They will clearly see that slope is equal to speed on a distance vs. time graph. They will also see that speed can change during a 50 meter run and that when the run is broken down into 10 meter intervals, the runner with the best average speed may not necessarily have the best speed during all intervals. A full and detailed set of teacher notes is included. I have conducted this lab for five consecutive years and improved upon it each time. This lab is ideal for middle or high school. It requires approximately three 40 minute class periods. Equipment requirements are minimal.