For time:
Run, 400 m
-- then --
9 Back Squats, 80/55 kg ( from rack)
9 Box Jump Overs, 60/50cm
15 Back Squats, 80/55 kg
15 Box Jump Overs,
21 Back Squats, 80/55 kg
21 Box Jump Overs
-- then --
Run, 400 m

Timecap: 15 mins

For the squat , use 60%-70% of your max!