Four Corners Escalator

Combination of Four Corners and an Escalator. Four exercises. 10 reps, run to next corner, 10 reps+20 reps next exercise, run, 10, 20, 30 reps, run, 10, 20, 30, 40 reps, run to start. Can go back down escalator: 40, 30, 20, 10, run, 30, 20, 10, run, 20, 10, run, 10.