Get warmed up and use the entire class, rest as needed between sprints.....
1 800m sprint
2 400m sprints
6 200m sprints
Each one of these should be an all out effort for that run, don't leave anything on the table.
In any order you want to, use the whiteboards to keep track of your efforts against the running clock.
Log the total time it took you to complete the 9 sprints.
Count only the time you ran, not the time you rested.